第12次实验作业

#include<stdio.h>
#include<string.h>
int main()
{
int i,t,m;
char sx[80],smlen[80];
printf("输入5个字符串：");
scanf("%s",sx);
strcpy(smlen,sx);
for(i=1;i<5;i++){
scanf("%s",sx);
if(strlen(smlen)<strlen(sx)){
strcpy(smlen,sx);
}
}
printf("maxlen is %s\n",smlen);
return 0;
}

#include<stdio.h>
#include<string.h>
int main()
{
int i,DX=0,XX=0,SZ=0,KG=0,QT=0;
char str[80];
gets(str);
for(i=0;i<=strlen(str);i++){
if(str[i]>='A'&&str[i]<='Z')
DX++;
else if(str[i]>='a'&&str[i]<='z')
XX++;
else if(str[i]>='0'&&str[i]<='9')
SZ++;
else if(str[i]==' ')
KG++;
else QT++;
}
printf("大写字符%d个\n小写字符%d个\n数字%d个\n空格%d个\n其他%d个\n",DX,XX,SZ,KG,QT);
return 0;
}

#include<stdio.h>
#include<string.h>
struct student{
char name[20];
float grade1;
float grade2;
float grade3;
int sno;
float avg;
};
int Count=0;
void new_stu(struct student stu[],int n);
void search_stu(struct student stu[],char *name);
void print_stu(struct student stu[]);
void avg_grade(struct student stu[]);
int main(void)
{
int choice,n;
char name[10];
struct student stu[50];
do{
printf("******学生信息管理系统*******\n");
printf("\t 1:新建\n");
printf("\t 2:输出\n");
printf("\t 3:平均成绩\n");
printf("\t 4:查找\n");
printf("\t 0:退出\n");
printf("请选择功能：");
scanf("%d",&choice);
switch(choice){
case 1:
printf("输入学生个数：");
scanf("%d",&n);
new_stu(stu,n);
break;
case 2:print_stu(stu);
break;
case 3:avg_grade(stu);
break;
case 4:
printf("请输入查找的人名：");
scanf("%s",name);
search_stu(stu,name);
break;
case 0:break;
}
}while(choice!=0);
printf("谢谢使用！\n");
return 0;
}
void print_stu(struct student stu[])
{
printf("该学生为：\n");
int i;
for(i=0;i<Count;i++)
{
printf("%d	%s	%.2f	%.2f	%.2f\n",stu[i].sno,stu[i].name,stu[i].grade1,stu[i].grade2,stu[i].grade3);
}
}
void new_stu(struct student stu[],int n)
{
int i;
if(Count==50){
printf("系统已满！\n");
return;
}
printf("请输入%d学生的学好，姓名，成绩1，成绩2，成绩3\n",n);
for(i=Count;i<Count+n;i++){
scanf("%d%s%f%f%f",&stu[i].sno,stu[i].name,&stu[i].grade1,&stu[i].grade2,&stu[i].grade3);
}
Count=Count+n;
}
void search_stu(struct student stu[],char *name)
{
int i,flag=0;
if(Count==0){
printf("系统是空的！\n");
return;
}
for(i=0;i<Count;i++)
if(strcmp(name,stu[i].name)==0){
flag=1;
break;
}
if(flag){
printf("学号：%d，姓名：%s",stu[i].sno,stu[i].name);
printf("成绩1：%.2f成绩2%.2f成绩3%.2f\n",stu[i].grade1,stu[i].grade2,stu[i].grade3);
}
else
printf("无此学生！");
}
void avg_grade(struct student stu[])
{
int i;
if(Count==0){
printf("该系统无学生！\n");
return;
}
printf("输出每个学生平均成绩\n");
for(i=0;i<Count;i++){
stu[i].avg=(stu[i].grade1+stu[i].grade2+stu[i].grade3)/3;
printf("第%d个学生的平均成绩为：%.2f\n",i+1,stu[i].avg);
}
}