qfedu-basic-level/day9/case5.cpp

// 定义函数, 实现字符串中某个字符的查找, 并返回字符的下标或 -1
#include <iostream>

using namespace std;
int findCharAt(char str[], int size, char ch)
{
    for (int i = 0; i < size; i++)
    {
        if (str[i] == ch)
            return i;
        else if (str[i] == '\0' && str[i] != ch)
            return -1;
    }
}

int main()
{
    // char str[] = "abcdefg";
    char str[128];
    cout << "请输入字符串: ";
    cin >> str;
    char ch;
    cout << "请输入要查找的字符: ";
    cin >> ch;
    int size = sizeof(str) / sizeof(str[0]);
    int index = findCharAt(str, size, ch);
    cout << "下标为: " << index << endl;
    return 0;
}