求大佬看看。

int h1,h2,m1,m2; 
int s,v;
double t;
scanf("%d %d",&s,&v);
t=(double)s/v;
if(t-(int)t>1e-9)t=(int)t+1;

h1=(int)t/60;
m1=(int)t%60;
h2=7-h1;
m2=50-m1;
if(m2<0){
    m2=60+m2;
    h1--;
};
if(h2<0){
    h2=24+h2;
};
if(h2<10){
    printf("0%d:",h2);
}else{
printf("%d:",h2);};
if(m2<10){
    printf("0%d",m2);
}else{
printf("%d",m2);};
return 0;