该函数返回一个指向最终的目标字符串 dest 的指针。
示例: /* * @Author: Your name * @Date: 2020-02-19 12:23:12 * @Last Modified by: Your name * @Last Modified time: 2020-02-19 12:56:42 */#include<stdio.h>#include<stdlib.h>#include<string.h>#define SIZE 30#define BUGSIZE 13char *s_get(char *str,int n);int main(){ char flower[SIZE]; char addon[] = "s smell like old shoes."; char bug[BUGSIZE]; int available; puts("what is your favorite flower?"); s_get(flower,SIZE); if(strlen(addon)+strlen(flower)+1<=SIZE)//注意要给拼接后的字符串长度加一才能能够存放空字符 { strcat(flower,addon);//用strcat()函数拼接字符串,前提是第一个数组的长度足够大,能够容纳两个字符串的长度再加上一个空字符的长度 } puts(flower); puts("what is your favorite bug?"); s_get(bug,BUGSIZE); available = BUGSIZE-strlen(bug)-1;//之所以要减去1是因为还有一个空字符 strncat(bug,addon,available);//添加一部分字符串到bug里面 puts(bug); getchar(); return 0;}char *s_get(char *str,int n){ char *ret; int i = 0; ret = fgets(str,n,stdin); if(ret) { while(str[i]!='n'&&str[i]!=' ') { i++; } if(str[i]=='n') { str[i] = ' '; } else { while(getchar()!='n') { continue; } } } return ret;}
上面这个图片解释了为什么要加1.