C语言实现结构体数组分数加法

#include<stdio.h>
#include<math.h>

typedef struct
{
    int fenZi;
    int fenMu;
}fenShu;

fenShu convert(fenShu tmp)
{
    int i,sttmp,sttmp2;
    sttmp=(tmp.fenZi>tmp.fenMu)? tmp.fenZi:tmp.fenMu;
    sttmp2=(tmp.fenZi>tmp.fenMu)? tmp.fenMu:tmp.fenZi;
    sttmp=sqrt(sttmp);
    for(i=2;i<=sttmp&&i<=sttmp2;i++)
    {
        if(tmp.fenZi%i==0&&tmp.fenMu%i==0)
        {
           tmp.fenZi/=i;
           tmp.fenMu/=i;
           i--;
        }
    }
    return tmp;

}

fenShu add(fenShu a,fenShu b)
{

    fenShu tmp;
    tmp.fenMu=a.fenMu*b.fenMu;
    tmp.fenZi=a.fenZi*b.fenMu+a.fenMu*b.fenZi;
    return convert(tmp);
}

void main()
{
   fenShu num1,num2,tmpnum;
   int tmp;
   printf("\t\tBetween fenShu and fenMu is / \n\n");
   do{
       printf("Please input the first fenShu num1:");
       scanf("%d/%d",&num1.fenZi,&num1.fenMu);
   }while(num1.fenMu==0);
   do{
       printf("Please input the second fenShu num2:");
       scanf("%d/%d",&num2.fenZi,&num2.fenMu);
   }while(num2.fenMu==0);
   tmpnum=add(num1,num2);
   printf("\n\tThe answer is :\t");
   printf("%d/%d",tmpnum.fenZi,tmpnum.fenMu);
   getch();
}

较完整版
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
typedef struct{                 //分数数型