strlen函数

strlen函数

//求字符串长度

size_t strlen(const char* str)
const char* str  要求长度的字符串

库中实现的strlen函数

int main (){  char szInput[256];  printf ("Enter a sentence: ");  gets (szInput);  printf ("The sentence entered is %u characters long.\n",(unsigned)strlen(szInput));  return 0;}

模拟实现strlen函数

size_t My_strlen(const char* str){assert(str);size_t count = 0;while (*str++){++count;}return count;}int main(){char str[] = "qweryu vvvvvvvvvvvvv";printf("str:%d\n", My_strlen(str));system("pause");return 0;}