实验7
#include <stdio.h> #include <stdlib.h> #define N 10 typedef struct student { int num; char name[20]; int score; }STU; int main() { STU st, stmax, stmin; int i; FILE *fp; fp = fopen("file1.dat", "r"); if( !fp ) { printf("fail to open file1.dat\n"); exit(0); } stmax.score = 0; stmin.score = 100; while( !feof(fp) ) {//修改处,源代码为:for(i=0; i<N; i++) fscanf(fp, "%d %s %d", &st.num, st.name, &st.score); if(st.score > stmax.score) stmax = st; else if(st.score < stmin.score) stmin = st; } fclose(fp); printf("最高分学生信息: %5d%15s%5d\n", stmax.num, stmax.name, stmax.score); printf("最低分学生信息: %5d%15s%5d\n", stmin.num, stmin.name, stmin.score); return 0; }
#include <stdio.h> #include <stdlib.h> #define N 10 typedef struct student { int num; char name[20]; int score; }STU; void sort(STU *pst, int n); int main() { FILE *fin, *fout; STU st[N]; int i; fin = fopen("file1.dat", "r"); if( !fin ) { printf("fail to open file1.dat\n"); exit(0); } for(i=0; i<N; i++) fscanf(fin, "%d %s %d", &st[i].num, st[i].name, &st[i].score); fclose(fin); sort(st, N); fout = fopen("file3.dat", "w"); if( !fout ) { printf("fail to open file1.dat\n"); exit(0); } for(i=0; i<N; i++) { printf("%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score); fprintf(fout, "%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score); } fclose(fout); return 0; } void sort(STU *pst, int n) { STU *pi, *pj, t; for(pi = pst; pi < pst+n-1; pi++) for(pj = pi+1; pj < pst+n; pj++) if(pi->score < pj->score) { t = *pi; *pi = *pj; *pj = t; } }
#include <stdio.h> #include <stdlib.h> #define N 10 typedef struct student { int num; char name[20]; int score; }STU; void sort(STU *pst, int n); int main() { FILE *fin, *fout; STU st[N]; int i; fin = fopen("file1.dat", "r"); if( !fin ) { printf("fail to open file1.dat\n"); exit(0); } for(i=0; i<N; i++) fscanf(fin, "%d %s %d", &st[i].num, st[i].name, &st[i].score); fclose(fin); sort(st, N); fout = fopen("file3.dat", "wb"); if( !fout ) { printf("fail to open file1.dat\n"); exit(0); } for(i=0; i<N; i++) { printf("%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score); fprintf(fout, "%-6d%-10s%3d\n", st[i].num, st[i].name, st[i].score); } fclose(fout); return 0; } void sort(STU *pst, int n) { STU *pi, *pj, t; for(pi = pst; pi < pst+n-1; pi++) for(pj = pi+1; pj < pst+n; pj++) if(pi->score < pj->score) { t = *pi; *pi = *pj; *pj = t; } }
#include <stdio.h> #include <string.h> #include <stdlib.h> const int N = 10; // 定义结构体类型struct student,并定义其别名为STU typedef struct student { long int id; char name[20]; float objective; /*客观题得分*/ float subjective; /*操作题得分*/ float sum; char level[10]; }STU; // 函数声明 void input(STU s[], int n); void output(STU s[], int n); void process(STU s[], int n); int main() { STU stu[N]; printf("录入%d个考生信息: 准考证号,姓名,客观题得分(<=40),操作题得分(<=60)\n", N); input(stu, N); printf("\n对考生信息进行处理: 计算总分,确定等级\n"); process(stu, N); printf("\n打印考生完整信息: 准考证号,姓名,客观题得分,操作题得分,总分,等级\n"); output(stu, N); return 0; } // 录入考生信息:准考证号,姓名,客观题得分,操作题得分 void input(STU s[], int n) { int i; FILE *fin; fin=fopen("examinee.txt","r");//只读方式打开"examinee.txt" if(fin==NULL){//若打开失败,则显示提示信息,然后退出程序 printf("fail to open examinee.txt\n"); exit(0); } for(i=0;i<n;i++){ fscanf(fin,"%d %s %f %f",&s[i].id,s[i].name,&s[i].objective,&s[i].subjective); }//从原文件读取数据 fclose(fin); } //输出考生完整信息: 准考证号,姓名,客观题得分,操作题得分,总分,等级 void output(STU s[], int n) { int i; FILE *fout; fout=fopen("result.txt","w");// 以只写文本方式打开/创建文件"result.txt" for(i=0;i<n;i++){ printf("%5d %10s %5.1f %5.1f %5.1f %10s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);//在屏幕上输出结果 fprintf(fout,"%5d %10s %5.1f %5.1f %5.1f %10s\n",s[i].id,s[i].name,s[i].objective,s[i].subjective,s[i].sum,s[i].level);//在文件里输出结果 } fclose(fout); } void process(STU s[], int n) { int i,j,k,m=0; STU temp; for(i=0;i<n;i++) s[i].sum=s[i].objective+s[i].subjective; for(j=0;j<n;j++){ for(k=j;k<n;k++){ if(s[j].sum<s[k].sum){ temp=s[j]; s[j]=s[k]; s[k]=temp; } } }//对学生总分进行排序 while(m<=n){ if(m<=n*0.1-1) strcpy(s[m].level,"优秀"); else if(m>n*0.1-1&&m<=n*0.5-1) strcpy(s[m].level,"合格"); else strcpy(s[m].level,"不合格"); m++; };//评定等级 }