C-Program to print Multiplication by using Addition

#include<stdio.h>

int main()

{

 int a,b,i,multiplication=0;

 printf("Enter a,b\n");

 scanf("%d%d",&a,&b);

 if(b<0)

 {

  a=a+b;

  b=a-b;

  a=a-b;

 }

 if(a>=0)

 {

      for(i=1;i<=a;i++)

     multiplication+=b;

 }

 if(a<0)

 {

  for(i=a;i<=-1;i++)

  multiplication-=b;

 }

 printf("Multiplication=%d\n",multiplication);

return 0;

}