Question

I made this program to print up time in hours,minutes and seconds

#include<stdio.h>

int main()

{

float a, b,x,mina,minb,hrsa,hrsb;
float seca,secb;
FILE *fp = fopen("/proc/uptime", "r");
fscanf(fp, "%f %f", &a, &b);

seca=(a)%60;
mina=seca/60;
hrsa=mina/60;

secb=(b)%60;
minb=secb/60;
hrsb=minb/60;

printf("Uptime=%f hrs %f min %f sec",hrsa,mina,seca);

printf("Idealtime =%f hrs %f min %f sec",hrsb,minb,secb);

return 0;
}

here i am getting an error “invalid operands to binary” in lines 12 and 16.

Answer 1

You can’t do mod (%) on floats. Try ((long)a)%60; Or even (long long), but the 68 years that 1<<31 seconds provides should be sufficient….

Also, you need another mod operation on minutes, or else 3601 seconds becomes “1 hour 60 minutes, 1 second”, instead of “1 hour 0 minutes, 1 second”.