C语言 strchr 函数用法
C语言中strchr函数作用是为在一个串中查找给定字符的第一个匹配之处，该函的原型为“char *strchr(const char *str, int c)”，使用时向str传入要被检索的字符串，c传入要搜索的字符即可。
演示实例
#include <stdio.h>
#include <string.h>
int main ()
{
const char str[] = "http://www.runoob.com";
const char ch = '.';
char *ret;
ret = strchr(str, ch);
printf("|%c| 之后的字符串是 - |%s|\n", ch, ret);
return(0);
}编译后运行结果：
|.| 之后的字符串是 - |.runoob.com|
使用示例
//#define FIRST_DEMO
#define SECOND_DEMO
#ifdef FIRST_DEMO
#include <stdio.h>
#include <conio.h>
#include <string.h>
#pragma warning (disable:4996)
int main(void)
{
char string[17];
char *ptr;
char c='T';
strcpy(string,"This is a string");
ptr=strchr(string,c);
if (ptr)
{
printf("The character %c is at position:%d\n",c,ptr-string);
}
else
{
printf("The character was not found\n");
}
getch();
return 0;
}
#elif defined SECOND_DEMO
#include <stdio.h>
#include <conio.h>
#include <string.h>
#pragma warning (disable:4996)
int main(void)
{
char answer[100];
char *p;
printf("Type something:\n");
fgets(answer,sizeof answer,stdin);
if ((p=strchr(answer,'\n'))!=NULL) /*fgets不会像gets那样自动地去掉结尾的\n，所以程序中手动将\n位置处的值变为\0,代表输入的结束。*/
{
*p='\0';
}
printf("You typed \"%s\"\n",answer);
getch();
return 0;
}
#endif
