C实例----在字符串指定位置插入字符

代码：

#include <stdio.h>#include <string.h>#include <stdlib.h>void Insert (char c, int pos, char *src){    int i, L;    L = (int)strlen(src);    if (L < pos)    {        src[L] = c;        src[L + 1] = '\0';    }    else    {        for (i = L; i > pos; i --)        {            src[i] = src[i - 1];        }        src[pos] = c;        src[L + 1] = '\0';    }}int main (){    char *string;    if ((string = (char *)malloc(20*sizeof(char))) == NULL)    {        printf("Malloc Error!\n");        return 1;    }    memset(string, 0, 20*sizeof(char));    strcpy(string, "Helo World!");    printf("src : %s\n", string);    Insert('l', 3, string);    printf("src : %s\n", string);    return 0;}

运行结果：