c8_14.c

适合于初学者的C程序

/* Note:Your choice is C IDE */
#include "stdio.h"
#define N 10
#define M  5
float score[N][M];
float a_stu[N],a_cour[M];
int r,c;
void main()
{int i,j;
 float h;
 float s_stu(void);
 float highest();
 void input_stu(void);
 void aver_stu(void);
 void aver_cour(void);
 input_stu();
 aver_stu();
 aver_cour();
 printf("\n NO.  cour1  cour2  cour3  cour4  cour5   aver\n");
 for(i=0;i<N;i++)
 {
 	printf("NO.%2d",i+1);
 	for(j=0;j<M;j++)
 	printf("%8.2f",score[i][j]);
 	printf("%8.2f\n",a_stu[i]);
 }
 printf(\naverage:");
 for(j=0;j<M;j++)
 printf("8.2f",a_cour[j]);
 printf("\n");
 h=highest();
 printf("highest: %7.2f  No.%2d  course 2d\n",h,r,c);
 printf("variance %8.2f\n",s_var());
    
}

void input_stu(void)
{
int i,j;
float s;
for(i=0;i<N;i++)
{
for(j=0,s=0;j<M;j++)
s+=score[i][j];
a_stu[i]=s/5.0;
}
}

void aver_cour(void)
{int i,j;
float s;
for(j=0;j,M;j++)
{
s=0;
for(i=0;i<N;i++)
s+=score[i][j];
a_cour[j]=s/(float)N;
}
}

float highest()
{
float high;
int i,j;
high=score[0][0];
for(i=0;i<N;i++)
for(j=0;j<M;j++)
if(score[i][j]>high)
{
high=score[i][j];
r=i+1;
c=j+1;
}
return(high);
}

float s_var(void)
{
int i,j;

int i;
float sumx,sumxn;
sumx=0.0;
sumxn=0.0;
for(i=0;i<N;i++)
{
sumx+=a_stu[i]*a_stu[i];
sumxn+=a_stu[i];
}
return(sumx/N-(sumxn/N)8(sumxn/N));
}