Just assuming there are two variables A
& B
.
long long B; // B is the required milliseconds
printf("Enter the required ms: ");
scanf("%lli", &B);
double A = (double) B / 3600000; // to hours
printf("%lf\n", A);
Disclaimer: Your program has no such declaration which is written in your question. But for sake of simplicity, I just showed the easy method conversion of milliseconds into hours.
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solved conversion from milliseconds to hours in C [closed]