Thread: problem of add two fractions

i have a problem to print out the sum of the fraction

i cannot printf anything of it

printf("Please enter the first number\n");
fgets(line, sizeof(line),stdin);
sscanf(line,"%d%d",&nump1, &demon1);
//puts(line);
printf("Please enter the second number\n");
fgets(line, sizeof(line),stdin);
sscanf(line,"%d%d",&nump2, &demon2);
//puts(line);
sum=((nump1*demon2)+(nump2*demon1))/(demon1*demon2);

i think i am doing a right track but not sure why cannot printout

and after get the result
what is the best way to get lowest common denominator

thanx

hi thanx for reply

i did add this line printf("The sum is %d", sum);

i forgot to post it


it displayed what i dont suppose

help

yea thanx

but i want the result like 1/3+2/7 =13/21

i want the result is 13/21

Then simply have 2 sum values, one for the numerator and one for the denominator like so:

Code:

sum_nom=((nump1*denom2)+(nump2*denom1));
sum_denom=(denom1*denom2);

And then use printf() like so:

Code:

printf("Sum is: %d/%d\n",sum_nom,sum_denom);

Code:

#include<iostream.h>
#include<math.h>
struct fractions
{
	 float a,b,c,d,e,f;
};

float sum (float u,float v);
int GCD(int a, int b);
int main (void)
{
 fractions f1;
 cout<<"Enter Integer value of numerator of first fraction= ";
 cin>>f1.a;
 cout<<"Enter Integer value of dinominator of first fraction= ";
 cin>>f1.b;
 cout<<"Hence first fraction= "<<f1.a<<"/"<<f1.b<< endl;
 cout<<"Enter Integer value of numerator of second fraction= ";
 cin>>f1.d;
 cout<<"Enter Integer value of dinominator of second fraction= ";
 cin>>f1.e;
 cout<<"Hence second fraction= "<<f1.d<<"/"<<f1.e<< endl;
 f1. c = f1.a/f1.b;
 f1. f = f1.d/f1.e;
 float result=sum(f1.c,f1.f);
 int i=result*pow(10,3);
 int j=pow(10,3);
 int k=GCD(i,j);
 i=i/k;
 j=j/k;
 cout<<f1.a<<"/"<<f1.b<<" + "<<f1.d<<"/"<<f1.e<<" = "<<i<<"/"<<j<<endl;

 return 0;
 }
 float sum (float u,float v)
 {
	 float w;
	 w=u+v;
    return w;
 }
 int GCD(int a, int b)
{
	 while( 1 )
	 {
		  a = a % b;
		if( a == 0 )
			return b;
		b = b % a;

		  if( b == 0 )
			return a;
	 }
}

this also add two fractions but not for all fractions. plz tell me what is the problem..........

The problem is you didn't read the forum guidelines. Don't bump old threads. Start your own thread, then you tell us what the problem is, and we'll help you fix it.

EDIT: And you're writing C++, but posting in the C forum. Pick the right forum for your post.