[C语言习题]第8章-善于利用指针

#include <stdio.h> int main() {void avsco(float *,float *); void avcour1(char (*)[10],float *); void fali2(char course[5][10],int num[],float *pscore,float aver[4]); void good(char course[5][10],int num[4],float *pscore,float aver[4]); int i,j,*pnum,num[4]; float score[4][5],aver[4],*pscore,*paver; char course[5][10],(*pcourse)[10]; printf("input course:\n"); pcourse=course; for (i=0;i<5;i++) scanf("%s",course[i]); printf("input NO. and scores:\n"); printf("NO."); for (i=0;i<5;i++) printf(",%s",course[i]); printf("\n"); pscore=&score[0][0]; pnum=&num[0]; for (i=0;i<4;i++) {scanf("%d",pnum+i); for (j=0;j<5;j++) scanf("%f",pscore+5*i+j); } paver=&aver[0]; printf("\n\n"); avsco(pscore,paver); // 求出每个学生的平均成绩 avcour1(pcourse,pscore); // 求出第一门课的平均成绩 printf("\n\n"); fali2(pcourse,pnum,pscore,paver); // 找出2门课不及格的学生 printf("\n\n"); good(pcourse,pnum,pscore,paver); // 找出成绩好的学生 return 0; } void avsco(float *pscore,float *paver) // 求每个学生的平均成绩的函数 {int i,j; float sum,average; for (i=0;i<4;i++) {sum=0.0; for (j=0;j<5;j++) sum=sum+(*(pscore+5*i+j)); //累计每个学生的各科成绩 average=sum/5; //计算平均成绩 *(paver+i)=average; } } void avcour1(char (*pcourse)[10],float *pscore) // 求第一课程的平均成绩的函数 {int i; float sum,average1; sum=0.0; for (i=0;i<4;i++) sum=sum+(*(pscore+5*i)); //累计每个学生的得分 average1=sum/4; //计算平均成绩 printf("course 1:%s average score:%7.2f\n",*pcourse,average1); } void fali2(char course[5][10],int num[],float *pscore,float aver[4]) // 找两门以上课程不及格的学生的函数 {int i,j,k,labe1; printf(" ==========Student who is fail in two courses======= \n"); printf("NO. "); for (i=0;i<5;i++) printf("%11s",course[i]); printf(" average\n"); for (i=0;i<4;i++) {labe1=0; for (j=0;j<5;j++) if (*(pscore+5*i+j)<60.0) labe1++; if (labe1>=2) {printf("%d",num[i]); for (k=0;k<5;k++) printf("%11.2f",*(pscore+5*i+k)); printf("%11.2f\n",aver[i]); } } } void good(char course[5][10],int num[4],float *pscore,float aver[4]) // 找成绩优秀学生(各门85以上或平均90分以上)的函数 {int i,j,k,n; printf(" ======Students whose score is good======\n"); printf("NO. "); for (i=0;i<5;i++) printf("%11s",course[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)||(aver[i]>=90)) {printf("%d",num[i]); for (k=0;k<5;k++) printf("%11.2f",*(pscore+5*i+k)); printf("%11.2f\n",aver[i]); } } }