C / C++ / MFC

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

 
float summation(float g);
int main(int argc,int *argv[])
{
 srand(12345);
float z;
float a=0.2,y=0.0;
int i;
for(i=0;i<5;i++)
{
float b=((float)rand()/(float)(RAND_MAX))*a;
printf("%f\n",b);
 
z=summation(b);
}
printf("summation:\n%f\n",z);
return 0;
} 
//=========================================================
float summation(float g)
{
		int i;
		float y[5],sum =0.0;
		float c=0.0;
 
			for(i=1;i<5;i++)
				{
					float z=y[i]-c;
					float t = sum+z;
					c=(t-sum)-z;
					sum=t;
					return sum;
					//printf("\n\n%f\t=",sum);
				}
}