02 | C找到字符串中字串出现的次数


#include 
#include <string.h>
int countStr(char* str, char* substr) {
    char *p = strstr(str, substr);    //问题的关键在这个函数,会返回第一个匹配到的位置
    int count = 0;
    while (p != NULL) {
        count++;
        p += strlen(substr);  //截取
        p = strstr(p, substr);
    }
    return count;
}

int main() {
    char a[] = "uiosdfzdf";
    char b[] = "zd";
    int result = countStr(a, b);
    printf("字串出现了%d次\n", result);
    getchar();
    return 0;
}