C程序设计教程与实验 实验四 吉顺如.docx

C程序设计教程与实验实验四
Sy4_1:
#include<>
main()
{
char ch,c1,c2;
printf("Enteer a character:");
ch=getchar();
if((ch>=='a')&&(ch<=='z'));
ch-=32;
c1=ch-1;
c2=ch+1;
if(ch='A') c1=ch+25;
else if(ch='Z') c2=ch-25;
putchar(c1);
putchar(ch);
putchar(c2);
putchar("\n");
}
Sy4_2:
#include<>
main()
{
int a,b,c,max;
printf("please input three:\n");
scanf("%d%d%d",&a,&b,&c);
max=a;
if(c>b)
{if(c>a) max=c;}
else
if(b>a) max=b;
printf("%d\n",max);
}
Sy4_3:
#include<>
main()
{
int m;
printf("input the month number:\n");
scanf("%d",&m);
switch(m)
{
case 1:printf("Jan");break;
case 2:printf("Feb");break;
case 3:printf("Mar");break;
case 4:printf("Api");break;

}
}
Sy4_4:
#include<>
main()
{
char c;
scanf("%c",&c);
if(c>='0'&&c<='9')
printf("0-9\n");
else if(c>='A'&&c<='Z')
printf("A-Z\n");
else if(c>='a'&&c<='z')
printf("a-z\n");
else
printf("!,@,...\n");
}
Sy4_5:
#include<>
main()
{
int a,b,d;
char ch;
printf("Please input a expression:");
scanf("%d%c%d",&a,&ch,&b);
switch(ch)
{
case'+':d=a+b;
printf("%d+%d=%d\n",a,b,d);
break;
case'-':d=a-b;
printf("%d-%d=%d\n",a,b,d);
break;
case'*':d=a*b;
printf("%d*%d=&d\n",a,b,d);
break;
case'/':
if(b==0)
printf("Divisor is zero\n");
else
printf("%d/%d=%f\n",a,b,(float)a/b);
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