《C语言及程序设计初步》第36讲实践项目

#include <stdio.h>
int main()
{
char c;
int i;
scanf("%d",&i);
while((c=getchar())!='\n')
{
putchar(c-i);
}
return 0;
}

//循环加密
#include <stdio.h>
int main()
{
char c;
while((c=getchar())!='\n')
{
if((c>='W' && c<='Z') || (c>='w' && c<='z'))
putchar(c-22);
else
putchar(c+4);
}
return 0;
}

#include <stdio.h>
int main()
{
char c,frontIsSpace=0;
while((c=gerchar())!='\n')
{
if(c!=' ')
{
frontIsSpace=0;
putchar(c);
}
else if(frontIsSpace==0)
{
putchar(c);
frontIsSpace=1;
}
}
return 0;
}

#include <stdio.h>
int main()
{
char blood;
int a=0,b=0,o=0,ab=0;
printf("请输入血型序列(A,B,O,C(C代表AB型)):");
while((blood=getchar())!='X')
{
switch(blood)
{
case 'A':
a++;break;
case 'B':
b++;break;
case 'O':
o++;break;
case 'C':
ab++;break;
}
}
printf("A:%d\t",a);
printf("B:%d\t",b);
printf("O:%d\t",o);
printf("AB:%d\n",ab);
return 0;
}

#include <stdio.h>
int main()
{
char c;
int n=0,s=0,l=0,total=0;
printf("Please enter a sentence:");
scanf("%c",&c);
while(c!='\n')
{
if(c>='0' && c<='9')
n++;
else if(c==' ')
s++;
else if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
l++;
total++;
scanf("%c",&c);
}
printf("Number:%d\n",n);
printf("Space:%d\n",s);
printf("Letter:%d\n",l);
printf("Character:%d\n",total);
return 0;
}