P279_1015 学习数组与指针的交换使用

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题目要求：4个学生5门课程：1、求第一门课程的平均分 2、找出两门或以上课程不及格的学生并输出学号和全部课程成绩以及平均成绩3、找出平均成绩在90分以上或者全部课程成绩在85分以上的学生。要求三个函数实实现3个要求。

#include<stdio.h>

#include<stdlib.h>

int main()

{

void avsco(float*pscore,float *paver);

//count the average ofevery student's scores

void avcour1(float*pscore,char (*pcourse)[10]);

//count the average ofcourse one' scores

void fail2(float*pscore,int *pnum,float *paver,char (*pcourse)[10]);

//find out students whofailed on two courses

void good(float*pscore,int *pnum,float *paver,char (*pcourse)[10]);

//find out students whodo better in exam

inti,j,*pnum,num[4];

pnum = num;

floatscore[4][5],*pscore;

//create the score arrayand apointer,which point to the array

pscore =&score[0][0];

float aver[4],*paver;

//create the array ofthe aver of score and apointer,which point to thearray

paver = aver;

charcourse[5][10],(*pcourse)[10];

pcourse = course;

printf("inputcourse:\n");

for(i =0;i<5;i++)

{

scanf("%s",course[i]);

}

printf("\n");

printf("Please inout NO.and scores:\n");

printf("NO.");

for(i =0;i<5;i++)

{

printf(",%s",course[i]);

}

printf("\n");

for(i =0;i<4;i++)

{

scanf("%d",&num[i]);

for(j = 0;j<5;j++)

{

scanf("%f",pscore+5*i+j);

}

printf("\n\n");

avsco(pscore,paver);

//count the average ofevery student's scores

avcour1(pscore,pcourse);

//count the average ofcourse one' scores

printf("\n\n");

fail2(pscore,pnum,paver,pcourse);

//find out students whofailed on two courses

printf("\n\n");

good(pscore,pnum,paver,pcourse);

//find out students whodo better in exam

return 0;

}

void avsco(float *pscore,float *paver)

{

int i,j;

float sum,average;

for(i =0;i<4;i++)

{

sum = 0.0;

for(j = 0;j<5;j++)

{

sum +=*(pscore+5*i+j);

}

average = sum/5;

*(paver+i) = average;

}//for

}//avsco

void avcour1(float *pscore,char (*pcourse)[10])

{//count the average of course one' scores

int i;

float sum,average;

for(i =0;i<4;i++)

sum += *(pscore+5*i);

average = sum/4;

printf("course1:%s,average score:%7.2f\n",*pcourse,average);

}

void fail2(float *pscore,int *pnum,float *paver,char(*pcourse)[10])

{//find out students who failed on two courses

int i,j,k,label;

printf(" =======Student who is failed====== \n");

printf("NO.");

for(i =0;i<5;i++)

printf("s",*(pcourse+i));

printf(" average\n");

for(i =0;i<4;i++)

{

label = 0;

for(j = 0;j<5;j++)

{

if(*(pscore+5*i+j)<60.0) label++;

}//for

if(label>=2)

{

printf("%d",*(pnum+i));

for(k =0;k<5;k++)

printf(".2f",*(pscore+5*i+k));

printf(".2f\n",*(paver+i));

}//if

}//for

}//fail2

void good(float *pscore,int *pnum,float *paver,char(*pcourse)[10])

{//find out students who do better in exam

int i,j,k,n;

printf(" =======Student whose score is good====== \n");

printf("NO.");

for(i =0;i<5;i++)

printf("s",*(pcourse+i));

printf(" average\n");

for(i =0;i<4;i++)

{

n = 0;

for(j = 0;j<5;j++)

if(*(pscore+5*i+j)>85.0) n++;

if((n==5)||(*(paver+i)>90.0))

{

printf("%d",*(pnum+i));

for(k =0;k<5;k++)

printf(".2f",*(pscore+5*i+k));

printf(".2f\n",*(paver+i));

}//if

}//for

}//good

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