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#include<stdio.h>
 
main()
{ 
int pow(int);
int num=0,j=0,i=0,bin[30]={0},length=30;
printf("Enter Binary no");
while(length>0)
  { 
   scanf("%d",&bin[i]);
   i++;
   length--;
   }
var=i;
while((j<var)&&(i>0))
{ 
  num=num+bin[j]*(pow(i));
  j++;
  i--;  
}
printf("Decimal no is %d\t",num);
}
 
int pow(int num)
{
int temp=0;
while(num>=1)
     temp=2*num;
return temp;
}
 

prog.c:4: warning: return type defaults to ‘int’
prog.c: In function ‘main’:
prog.c:5: warning: conflicting types for built-in function ‘pow’
prog.c:14: error: ‘var’ undeclared (first use in this function)
prog.c:14: error: (Each undeclared identifier is reported only once
prog.c:14: error: for each function it appears in.)
prog.c:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result

Standard output is empty