求两个复数相加的算法

#include<stdio.h>
#include<math.h>
main()
{
float r,r1,r2,i,i1,i2;
printf("input the real part :");
scanf("%f",&r1);
printf("\n");
printf("input the imagine part :"); //第一个复数
scanf("%f",&i1);
printf("\n");

printf("input the real part :");
scanf("%f",&r2);
printf("\n");
printf("input the imagine part :");//第二个复数
scanf("%f",&i2);
printf("\n");
r=r1+r2;
i=i1+i2;
printf("the sum is :");
printf("%f+i%f",r,i);

}

2a+2b