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
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以上就是c语言 strchr 函数用法的详细内容。