C语言-C语言程序设计-Function-strcpy

C语言-C语言程序设计-Function-strcpy

书上关于strcpy介绍了数组、指针、指针简化的例子，对于代码简化是个可见的例子，记录下来。

#include <stdio.h>
#include <stdlib.h>

int main()
{
    //initial value
    char cTmp[] = "It will be better, tomorrow.";
    printf("cTmp:%s
", cTmp);

    char* pTmp =  "It will be better, tomorrow.";
    printf("pTmp:%s
", pTmp);

    char* pCon = malloc(100);
    memset(pCon, 0, sizeof(char));
    printf("pCon:%s
", pCon);

    //
    strcpy1(pCon, pTmp);
    printf("pCon1:%s
", pCon);
    memset(pCon, 0, sizeof(char));
    printf("pCon:%s
", pCon);

    strcpy2(pCon, pTmp);
    printf("pCon2:%s
", pCon);
    memset(pCon, 0, sizeof(char));
    printf("pCon:%s
", pCon);

    strcpy3(pCon, pTmp);
    printf("pCon3:%s
", pCon);
    memset(pCon, 0, sizeof(char));
    printf("pCon:%s
", pCon);

    strcpy4(pCon, pTmp);
    printf("pCon4:%s
", pCon);
    memset(pCon, 0, sizeof(char));
    printf("pCon:%s
", pCon);

    return 0;
}


void strcpy1(char *s, char *t)
{
    int i = 0;
    while((s[i]=t[i]) != '')
        i++;
}

void strcpy2(char *s, char *t)
{
    while((*s = *t) != '')
    {
        s++;
        t++;
    }
}

void strcpy3(char *s, char *t)
{
    while((*s++ = *t++) != '');
}

void strcpy4(char *s, char *t)
{
    while(*s++ = *t++);
}