gets + sscanf + strstr + sprintf

#include <cstdio>
#include <cstring>

const int N(100);

char str[N];

int main(){
    int len = strlen(gets(str));
    int now = 0;
    int hh, mm;
    while(now < len){
        while(now < len and *(str + now) == ' ') ++now;
        if(now == len) break;
        if(sscanf(str + now, "%d:%d", &hh, &mm) < 1) break;
        printf("get %02d:%02d\n", hh, mm);
        char* next = strstr(str + now, " ");
        if(next == 0) break;
        now = next - str;
    }
    sprintf(str, "%d+%d=%d", hh, mm, hh + mm);
    printf("%s", str);
    return 0;
}

/*
         23:58                 43:12             02:43              1:32
*/