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#include<stdio.h>
 
int main(){
     int n, i, j, bin_rev=0,bin=0;
     printf("Enter a number to convert : ");
     scanf("%d",&n);
 
     /*****************************/
     i=1;
    while(n){
        bin_rev=bin_rev+(n%2)*i;
        i=i*10;
        n=n/2; 
    }
 
    i=1;
    while(bin_rev){
        bin=bin+(bin_rev%10)*i;
        i=i*10;
        bin_rev=bin_rev/10;
     }
     /*****************************/
 
     printf("\nBinary is %d",bin);
 
     getch();
     return 0;
}

prog.c:26:6: warning: implicit declaration of function 'getch' is invalid in C99 [-Wimplicit-function-declaration]
     getch();
     ^
prog.c:4:16: warning: unused variable 'j' [-Wunused-variable]
     int n, i, j, bin_rev=0,bin=0;
               ^
2 warnings generated.
/home/fGWGh4/prog-b38c8a.o: In function `main':
prog.c:(.text+0xc1): undefined reference to `getch'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Standard output is empty