How to replace specific characters in a C language string?

In C language, loops and conditional statements can be used to replace specified characters in a string. Here is an example code:

#include <stdio.h>

void replaceChar(char *str, char oldChar, char newChar) {
    int i = 0;
    while (str[i] != '\0') {
        if (str[i] == oldChar) {
            str[i] = newChar;
        }
        i++;
    }
}

int main() {
    char str[] = "Hello, World!";
    char oldChar = 'o';
    char newChar = 'x';

    printf("原始字符串: %s\n", str);
    replaceChar(str, oldChar, newChar);
    printf("替换后字符串: %s\n", str);

    return 0;
}

The running result is:

原始字符串: Hello, World!
替换后字符串: Hellx, Wxrld!

In the example above, the replaceChar function takes a pointer to a string, a character to be replaced called oldChar, and a character to replace it with called newChar. It loops through each character in the string and replaces any instances of oldChar with newChar.