c - 在c中使用原型(prototype)将一个字符替换为另一个字符

Question

#include "stdafx.h"
#include "stdio.h"
void repl(char *string, char oldc, char newc);

char text[60] = { "I am going to replace the character a with the character i";
char newc = 'b';
char oldc = 'a';

int main()
{
    void repl(char *string, char oldc, char newc);

    return 0;

}

void repl(char *string, char oldc, char newc)
{
    int i = 0;
    for (i = 0; i < *string; i++)
    {
        if (*(string + i) == oldc)
        {
            *(string + i) == newc;
        }
    }
    printf("%s", string);
}

我正在尝试将字符 a 替换为字符 b。我知道如何在不使用指针的情况下做到这一点，但对于指针我不太确定。我得到的原型(prototype)是:

void repl(char *string, char oldc, char newc);

Answer 1

这就是你所追求的。我强烈建议您阅读一些基本的 C 编程主题，例如调用函数和声明 char 数组。与此同时...

#include "stdafx.h"
#include "stdio.h"
void repl(char *string, char oldc, char newc);

char text[60] = "I am going to replace the character a with the character i";
char newc = 'i';
char oldc = 'a';

int main()
{
    repl(text, oldc, newc);
    return 0;
}

void repl(char *string, char oldc, char newc)
{
    int i = 0;
    for (i = 0; string[i]; i++)
    {
        if (string[i] == oldc)
        {
            string[i] = newc;
        }
    }
    printf("%s", string);
}