C语言中删除字符串中一个字母,C程序删除字符串中除字母之外的所有字符

删除字符串中一个字母的C程序：

#include <stdio.h>
#include <string.h>

int main() {
    char str[100], letter;
    int i, j;

    printf("Enter a string: ");
    scanf("%s", str);

    printf("Enter a letter to delete: ");
    scanf(" %c", &letter);

    for (i = 0, j = 0; str[i] != '\0'; i++) {
        if (str[i] != letter) {
            str[j++] = str[i];
        }
    }
    str[j] = '\0';

    printf("Result: %s\n", str);

    return 0;
}

删除字符串中除字母之外的所有字符的C程序：

#include <stdio.h>
#include <string.h>

int main() {
    char str[100];
    int i, j;

    printf("Enter a string: ");
    scanf("%s", str);

    for (i = 0, j = 0; str[i] != '\0'; i++) {
        if ((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z')) {
            str[j++] = str[i];
        }
    }
    str[j] = '\0';

    printf("Result: %s\n", str);

    return 0;
}