LCM program in c with multiple numbers

#include<stdio.h>

int lcm(int,int);

int main(){

int a,b=1;
printf("Enter positive integers. To quit press zero.");

while(1){
scanf("%d",&a);
if(a<1)
break;
else if(a>b)
b = lcm(a,b);
else
b = lcm(b,a);
}

printf("LCM is %d",b);

return 0;
}

int lcm(int a,int b){

int temp = a;

while(1){
if(temp % b == 0 && temp % a == 0)
break;
temp++;
}

return temp;
}