法一：比较麻烦。。。
#include <bits/stdc++.h>
using namespace std;
//用istringstream方法读入带有前导零的数，并对前导零筛除的效果 
int main() {
    string timeStr = "01:17";  
    istringstream iss(timeStr); //创建istringstream对象，名字叫iss，把准备读入的timestr放进去 
    int hours, minutes;  
    char colon;  
    int m;
    iss >> hours >> colon >> minutes;  //从iss开始读取，>>符号的作用是读取连续数字类的字符，遇到非数字字符就会停止读取(同时把数字类字符变成整型，忽略前导零)读取位置会往后移动 
    m = hours*60 + minutes; 
    cout << "Hours:" << hours << ", Minutes:" << minutes << endl;  

    return 0; 
}
//运行结果： 
//Hours: 1, Minutes: 1
//
//--------------------------------
//Process exited after 0.6152 seconds with return value 0
//请按任意键继续. . .

法二：scanf可自动去掉前导零
#include <bits/stdc++.h>
using namespace std;
int main() {
    int hours, minutes;  
    scanf("%d:%d",&hours, &minutes);
    printf("hours:%d, minutes:%d",hours, minutes);
    return 0; 
}

//01:09
//hours:1, minutes:9
//--------------------------------
//Process exited after 6.024 seconds with return value 0
//请按任意键继续. . .