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掌握C语言编程，从这50个经典例题开始入门

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1. 打印“Hello, World!”

#include <stdio.h>

int main() {
    printf("Hello, World!\n");
    return 0;
}

2. 输入两个整数，计算并输出它们的和

#include <stdio.h>

int main() {
    int num1, num2, sum;
    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);
    sum = num1 + num2;
    printf("Sum = %d\n", sum);
    return 0;
}

3. 输入一个整数，判断它是正数、负数还是零

#include <stdio.h>

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    if (num > 0) {
        printf("Positive\n");
    } else if (num < 0) {
        printf("Negative\n");
    } else {
        printf("Zero\n");
    }
    return 0;
}

4. 输入三个整数，找出最大值

#include <stdio.h>

int main() {
    int num1, num2, num3, max;
    printf("Enter three integers: ");
    scanf("%d %d %d", &num1, &num2, &num3);
    max = num1;
    if (num2 > max) {
        max = num2;
    }
    if (num3 > max) {
        max = num3;
    }
    printf("Maximum = %d\n", max);
    return 0;
}

5. 输入一个圆的半径，计算并输出其面积和周长

#include <stdio.h>
#define PI 3.14159

int main() {
    float radius, area, circumference;
    printf("Enter the radius of the circle: ");
    scanf("%f", &radius);
    area = PI * radius * radius;
    circumference = 2 * PI * radius;
    printf("Area = %.2f\n", area);
    printf("Circumference = %.2f\n", circumference);
    return 0;
}

6. 输入一个整数，判断它是奇数还是偶数

#include <stdio.h>

int main() {
    int num;
    printf("Enter an integer: ");
    scanf("%d", &num);
    if (num % 2 == 0) {
        printf("Even\n");
    } else {
        printf("Odd\n");
    }
    return 0;
}

7. 输入三个整数，对它们进行排序

#include <stdio.h>

int main() {
    int num1, num2, num3, temp;
    printf("Enter three integers: ");
    scanf("%d %d %d", &num1, &num2, &num3);
    if (num1 > num2) {
        temp = num1;
        num1 = num2;
        num2 = temp;
    }
    if (num2 > num3) {
        temp = num2;
        num2 = num3;
        num3 = temp;
    }
    if (num1 > num2) {
        temp = num1;
        num1 = num2;
        num2 = temp;
    }
    printf("Sorted numbers: %d %d %d\n", num1, num2, num3);
    return 0;
}

8. 输入一个字符串，将其转换为小写

#include <stdio.h>

void toLowerCase(char *str) {
    while (*str) {
        if (*str >= 'A' && *str <= 'Z') {
            *str += 'a' - 'A';
        }
        str++;
    }
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    toLowerCase(str);
    printf("Lowercase string: %s\n", str);
    return 0;
}

9. 输入一个字符串，计算其中字符的数量

#include <stdio.h>

int countCharacters(char *str) {
    int count = 0;
    while (*str) {
        count++;
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int length = countCharacters(str);
    printf("Number of characters: %d\n", length);
    return 0;
}

10. 输入一个字符串，将其逆序输出

#include <stdio.h>

void reverseString(char *str) {
    int length = 0;
    char *end = str;
    while (*end) {
        length++;
        end++;
    }
    for (int i = length - 1; i >= 0; i--) {
        printf("%c", str[i]);
    }
    printf("\n");
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    reverseString(str);
    return 0;
}

11. 输入一个字符串，计算其中字母的数量

#include <stdio.h>

int countLetters(char *str) {
    int count = 0;
    while (*str) {
        if ((*str >= 'a' && *str <= 'z') || (*str >= 'A' && *str <= 'Z')) {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int letters = countLetters(str);
    printf("Number of letters: %d\n", letters);
    return 0;
}

12. 输入一个字符串，计算其中数字的数量

#include <stdio.h>

int countDigits(char *str) {
    int count = 0;
    while (*str) {
        if (*str >= '0' && *str <= '9') {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int digits = countDigits(str);
    printf("Number of digits: %d\n", digits);
    return 0;
}

13. 输入一个字符串，计算其中空格的数量

#include <stdio.h>

int countSpaces(char *str) {
    int count = 0;
    while (*str) {
        if (*str == ' ') {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int spaces = countSpaces(str);
    printf("Number of spaces: %d\n", spaces);
    return 0;
}

14. 输入一个字符串，计算其中非字母字符的数量

#include <stdio.h>

int countNonLetters(char *str) {
    int count = 0;
    while (*str) {
        if (!((*str >= 'a' && *str <= 'z') || (*str >= 'A' && *str <= 'Z'))) {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int nonLetters = countNonLetters(str);
    printf("Number of non-letter characters: %d\n", nonLetters);
    return 0;
}

15. 输入一个字符串，计算其中小写字母的数量

#include <stdio.h>

int countLowerCaseLetters(char *str) {
    int count = 0;
    while (*str) {
        if (*str >= 'a' && *str <= 'z') {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int lowerCaseLetters = countLowerCaseLetters(str);
    printf("Number of lowercase letters: %d\n", lowerCaseLetters);
    return 0;
}

16. 输入一个字符串，计算其中大写字母的数量

#include <stdio.h>

int countUpperCaseLetters(char *str) {
    int count = 0;
    while (*str) {
        if (*str >= 'A' && *str <= 'Z') {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int upperCaseLetters = countUpperCaseLetters(str);
    printf("Number of uppercase letters: %d\n", upperCaseLetters);
    return 0;
}

17. 输入一个字符串，计算其中元音字母的数量

#include <stdio.h>

int countVowels(char *str) {
    int count = 0;
    while (*str) {
        if ((*str == 'a') || (*str == 'e') || (*str == 'i') || (*str == 'o') || (*str == 'u') ||
            (*str == 'A') || (*str == 'E') || (*str == 'I') || (*str == 'O') || (*str == 'U')) {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int vowels = countVowels(str);
    printf("Number of vowels: %d\n", vowels);
    return 0;
}

18. 输入一个字符串，计算其中辅音字母的数量

#include <stdio.h>

int countConsonants(char *str) {
    int count = 0;
    while (*str) {
        if ((*str >= 'a' && *str <= 'z') || (*str >= 'A' && *str <= 'Z') &&
            (*str != 'a') && (*str != 'e') && (*str != 'i') && (*str != 'o') && (*str != 'u') &&
            (*str != 'A') && (*str != 'E') && (*str != 'I') && (*str != 'O') && (*str != 'U')) {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int consonants = countConsonants(str);
    printf("Number of consonants: %d\n", consonants);
    return 0;
}

19. 输入一个字符串，计算其中字母和数字的总数

#include <stdio.h>

int countAlphanumeric(char *str) {
    int count = 0;
    while (*str) {
        if ((*str >= 'a' && *str <= 'z') || (*str >= 'A' && *str <= 'Z') || (*str >= '0' && *str <= '9')) {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int alphanumeric = countAlphanumeric(str);
    printf("Number of alphanumeric characters: %d\n", alphanumeric);
    return 0;
}

20. 输入一个字符串，计算其中空格和标点符号的总数

#include <stdio.h>

int countSpacesAndPunctuation(char *str) {
    int count = 0;
    while (*str) {
        if ((*str == ' ') || (*str == '.') || (*str == ',') || (*str == '!') || (*str == '?') ||
            (*str == ';') || (*str == ':') || (*str == '-') || (*str == '(') || (*str == ')')) {
            count++;
        }
        str++;
    }
    return count;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int spacesAndPunctuation = countSpacesAndPunctuation(str);
    printf("Number of spaces and punctuation: %d\n", spacesAndPunctuation);
    return 0;
}

21. 输入一个字符串，计算其中元音字母和辅音字母的总数

#include <stdio.h>

int countVowelsAndConsonants(char *str) {
    int vowels = 0, consonants = 0;
    while (*str) {
        if ((*str >= 'a' && *str <= 'z') || (*str >= 'A' && *str <= 'Z')) {
            if ((*str == 'a') || (*str == 'e') || (*str == 'i') || (*str == 'o') || (*str == 'u') ||
                (*str == 'A') || (*str == 'E') || (*str == 'I') || (*str == 'O') || (*str == 'U')) {
                vowels++;
            } else {
                consonants++;
            }
        }
        str++;
    }
    return vowels + consonants;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int vowelsAndConsonants = countVowelsAndConsonants(str);
    printf("Number of vowels and consonants: %d\n", vowelsAndConsonants);
    return 0;
}

22. 输入一个字符串，计算其中元音字母和辅音字母的比率

#include <stdio.h>

float countVowelsAndConsonantsRatio(char *str) {
    int vowels = 0, consonants = 0;
    while (*str) {
        if ((*str >= 'a' && *str <= 'z') || (*str >= 'A' && *str <= 'Z')) {
            if ((*str == 'a') || (*str == 'e') || (*str == 'i') || (*str == 'o') || (*str == 'u') ||
                (*str == 'A') || (*str == 'E') || (*str == 'I') || (*str == 'O') || (*str == 'U')) {
                vowels++;
            } else {
                consonants++;
            }
        }
        str++;
    }
    if (consonants == 0) {
        return 0.0;
    }
    return (float)vowels / consonants;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    float ratio = countVowelsAndConsonantsRatio(str);
    printf("Ratio of vowels to consonants: %.2f\n", ratio);
    return 0;
}

23. 输入一个字符串，计算其中元音字母、辅音字母、空格和标点符号的总数

#include <stdio.h>

int countVowelsConsonantsSpacesPunctuation(char *str) {
    int vowels = 0, consonants = 0, spaces = 0, punctuation = 0;
    while (*str) {
        if ((*str >= 'a' && *str <= 'z') || (*str >= 'A' && *str <= 'Z')) {
            if ((*str == 'a') || (*str == 'e') || (*str == 'i') || (*str == 'o') || (*str == 'u') ||
                (*str == 'A') || (*str == 'E') || (*str == 'I') || (*str == 'O') || (*str == 'U')) {
                vowels++;
            } else {
                consonants++;
            }
        } else if (*str == ' ') {
            spaces++;
        } else if ((*str == '.') || (*str == ',') || (*str == '!') || (*str == '?') ||
                   (*str == ';') || (*str == ':') || (*str == '-') || (*str == '(') ||
                   (*str == ')')) {
            punctuation++;
        }
        str++;
    }
    return vowels + consonants + spaces + punctuation;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    int total = countVowelsConsonantsSpacesPunctuation(str);
    printf("Total number of vowels, consonants, spaces, and punctuation: %d\n", total);
    return 0;
}

24. 输入一个字符串，计算其中元音字母、辅音字母、空格和标点符号的比率

#include <stdio.h>

float countVowelsConsonantsSpacesPunctuationRatio(char *str) {
    int vowels = 0, consonants = 0, spaces = 0, punctuation = 0;
    while (*str) {
        if ((*str >= 'a' && *str <= 'z') || (*str >= 'A' && *str <= 'Z')) {
            if ((*str == 'a') || (*str == 'e') || (*str == 'i') || (*str == 'o') || (*str == 'u') ||
                (*str == 'A') || (*str == 'E') || (*str == 'I') || (*str == 'O') || (*str == 'U')) {
                vowels++;
            } else {
                consonants++;
            }
        } else if (*str == ' ') {
            spaces++;
        } else if ((*str == '.') || (*str == ',') || (*str == '!') || (*str == '?') ||
                   (*str == ';') || (*str == ':') || (*str == '-') || (*str == '(') ||
                   (*str == ')')) {
            punctuation++;
        }
        str++;
    }
    if (consonants == 0) {
        return 0.0;
    }
    return (float)(vowels + spaces + punctuation) / consonants;
}

int main() {
    char str[100];
    printf("Enter a string: ");
    scanf("%s", str);
    float ratio = countVowelsConsonantsSpacesPunctuationRatio(str);
    printf("Ratio of vowels, spaces, and punctuation to consonants: %.2f\n", ratio);
    return 0;
}

25. 输入一个字符串，计算其中元音字母、辅音字母、空格和标点符号的百分比

”`c #include

void countVowelsConsonantsSpacesPunctuationPercentage(char

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