四则运算 最新修改版

#include<stdio.h>
#include<malloc.h>
#include <conio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
char fuhao()
{

int xuanzhe;
time_t t;
srand((unsigned)time(&t));
xuanzhe=rand()%4+1;
switch(xuanzhe)
{
case 1:return'+';
case 2:return'-';
case 3:return'*';
case 4:return'/';
}
}
void main()
{
float shuru3;
time_t t;
int geshu,fanwei,shuliang,shu1,shu2,defen,shuru,xuanzhe,shu3,shuliang1,xuanzhe2,fujiati,shu4;
float b;
char c,c1;
char fenshu[10];
static char fenshudaan[10];
printf("*********************************************** ");
printf("输入1：2个数 ");
printf("输入2：3个数 ");
printf("请输入四则数目的个数");
scanf("%d",&geshu);
while(geshu!=1||geshu!=2)
{
printf("*********************************************** ");
printf("输入错误，请从新输入 ");
printf("输入1：2个数 ");
printf("输入2：3个数 ");
printf("请输入：");
scanf("%d",&geshu);
}
printf("请输入四则运算最大的数目(最好10-100):");
scanf("%d",&fanwei);
printf("请输入题目计算的数的最大量:");
scanf("%d",&shuliang);
if(geshu==1)
{

for(int i=1;i<=shuliang;i++)
{
c=fuhao();
srand((unsigned)time(&t));
shu1=rand()%fanwei+1;
shu2=rand()%fanwei+1;
if(c=='+')
{defen=shu1+shu2;
}
else if(c=='-')
{defen=shu1-shu2;
}
else if(c=='*')
{defen=shu1*shu2;
}
else if(c=='/')
{defen=shu1/shu2;
}
printf("第%d题:%d%c%d=",i,shu1,c,shu2);
scanf("%d",&shuru);
if(shuru==defen)
{
printf("正确! ");
}
else
{
printf("错误! ");
}
}
}
if(geshu==2)
{
for(int ii=1;ii<=shuliang;ii++)
{
srand((unsigned)time(&t));
shu1=rand()%fanwei+1;
shu2=rand()%fanwei+1;
shu3=rand()%fanwei+1;
shu4=rand()%16+1;

switch(shu4)
{
case 1:c1='*';c='-';
shuliang1=shu1*shu2-shu3;break;
case 2:c1='*';c='+';
shuliang1=shu1*shu2+shu3;break;
case 3:c1='/';c='-';
shuliang1=shu1/shu2-shu3;break;
case 4:c1='/';c='+';
shuliang1=shu1/shu2+shu3;break;
case 5:c1='/';c='/';
shuliang1=shu1/shu2/shu3;break;
case 6:c1='/';c='*';
shuliang1=shu1/shu2*shu3;break;
case 7:c1='*';c='+';
shuliang1=shu1*shu2+shu3;break;
case 8:c1='*';c='*';
shuliang1=shu1*shu2*shu3;break;
case 9:c1='-';c='+';
shuliang1=shu1-shu2+shu3;break;
case 10:c1='-';c='-';
shuliang1=shu1-shu2-shu3;break;
case 11:c1='-';c='*';
shuliang1=shu1-shu2*shu3;break;
case 12:c1='-';c='/';
shuliang1=shu1-shu2/shu3;break;
case 13:c1='+';c='-';
shuliang1=shu1+shu2-shu3;break;
case 14:c1='+';c='+';
shuliang1=shu1+shu2+shu3;break;
case 15:c1='+';c='*';
shuliang1=shu1+shu2*shu3;break;
case 16:c1='+';c='/';
shuliang1=shu1+shu2/shu3;break;
}
printf("第%d题:%d%c%d%c%d=",ii,shu1,c1,shu2,c,shu3);
scanf("%d",&shuru);
printf("%d",shuru);
if(shuru==shuliang1)
{
printf("正确! ");
}
else
{
printf("错误! ");
}
}
printf("是否做附加题(1:是。2:否。):");
scanf("%d",&fujiati);
if(fujiati==1)
{
srand((unsigned)time(&t));
xuanzhe2=rand()%5+1;
switch(xuanzhe2)
{
case 1:
strcpy(fenshu,"2/3");
printf("2/(4-1)=");
scanf("%s",fenshudaan);

break;
case 2:
printf("5/(13-1)=");
strcpy(fenshu,"5/12 ");
scanf("%s",fenshudaan);

break;
case 3:
strcpy(fenshu,"3/7");
printf("(1+2)/7=");
scanf("%s",fenshudaan);

break;

case 4:
strcpy(fenshu,"1/3");
printf("(4-3)/3=");
scanf("%s",fenshudaan);

break;
case 5:
strcpy(fenshu,"21");
printf("(4+3)*3=");
scanf("%s",fenshudaan);
break;

}

if(!strcmp(fenshu,fenshudaan))
{
printf("%s正确!",fenshudaan);
}
else
{
printf("%s错误!",fenshudaan);
}

}
else
{
printf("程序结束!");
exit(0);
}

printf("程序结束!");

}
}

心得体会：修改了很多if-else语句，修改了某些bug，修改了某些表达不清晰的提示。