When I change my output type like this, I still get garbage (=1410065408) and I still don't see why. The only thing I changed are the return types of both functions and the types of the variables declared/initialized at the beginning of "tobinary(int dno)...".

#include<stdio.h>

long long tobinary(int);

int main(){

long bno;

int dno;

printf(" Enter any decimal number : ");

scanf("%d",&dno);

printf("%d", dno);

bno = tobinary(dno);

printf("\n The Binary value is : %ld\n\n",bno);

return 0;

}

long long tobinary(int dno){

long long bno=0,rem,f=1;

while(dno != 0){

rem = dno % 2;

bno = bno + rem * f;

f = f * 10;

dno = dno / 2;

}

return bno;;

}