C program to convert Binary to decimal with floating point?

Question

Determine the set of inputs that will lead to SIGFPE (floating point exception) being triggered in following C program?

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
    if(argc != 3 || !atoi(argv[2]))
        return 1;
    return abs(atoi(argv[1])) / atoi(argv[2]);
}

Answer 1

#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<math.h>
void main()
{
    int a[20],b[20];
    int i,j,k,cntint,cntfra,flag,rem;
    float rem1;
    char s[20];
    cntint=cntfra=flag=rem=0;
    rem1=0.0;
    clrscr();
    printf("Enter the binary no : ");
    scanf("%s",s);
    for(i=0,j=0,k=0;i<strlen(s);i++)
    {
        if(s[i]=='.')
        {
            flag=1;
        }
    elseif(flag==0)
        a[j++]=s[i]-48;
    elseif(flag==1)
        b[k++]=s[i]-48;
    }
    cntint=j;
    cntfra=k;
    for(j=0,i=cntint-1;j<cntint;j++,i--)
    {
        rem = rem + (a[j] * pow(2,i));
    }
    for(k=0,i=1;k<cntfra;k++,i++)
    {
        rem1 = rem1 + (b[k] / pow(2,i));
    }
    rem1 = rem + rem1;
    printf("\nThe decimal value of the given binary is : %f",rem1);
    getch();
}


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