C++ compile error

apoch632

Trying to compile this code on ubuntu with g++. Getting these errors.

utime.cpp: In function ‘int main(int, char**)’:
utime.cpp:27: error: ‘exit’ was not declared in this scope
utime.cpp:35: error: ‘atoi’ was not declared in this scope
utime.cpp:57: error: ‘usleep’ was not declared in this scope

Can anyone see where I might be going wrong?
Cheers for any help.

#include<stdio.h>

#include<time.h>

#include <sys/time.h>

#include <sys/resource.h>

 

int main(int argc, char** argv){

 

struct  timeval tv;

struct  timezone tz;

int i,delay,num_iter;

 double init,start,stop;

if (argc!=3) {

    fprintf(stderr, "Usage: %s <sleep time..usec><num_iteration>\n", argv[0]);

    exit(1);

  }

 

//  progname=argv[0];

  delay=atoi(argv[1]);

  num_iter=atoi(argv[2]);

  printf("Delay is %d usec..num_iter is %d\n",delay,num_iter);

  gettimeofday( &tv,&tz);

  init=tv.tv_sec + tv.tv_usec*0.000001;

  for(i=0;i<num_iter;++i)

    {

      gettimeofday( &tv,&tz);

      start=tv.tv_sec + tv.tv_usec*0.000001;

     

      // Now sleep

      usleep(delay);

      gettimeofday( &tv,&tz);

      stop=tv.tv_sec + tv.tv_usec*0.000001;

           

      printf("Iteration %d..slept for %lf usec\n",i+1,(stop-start)*1000000);

    }

 

printf("Total time taken : actual %lf  theory(excl. runtime): %d,   usec \n",(stop-init)*1000000,num_iter*delay);

return 0;

}

ShoulderChip

sorry, no.

IRLConor

#include <stdlib.h>

?

When you get errors like that, look up the manpage for the missing functions (e.g. "man atoi") and it will usually tell you what you need to include at the top.

apoch632

Cheers man. I'd a feeling it was something silly like that i left out.