c语言程序段,C语言重要程序段.doc

C语言重要程序段

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#include

void main( )

{

int n, rem;

printf("enter a number:");

scanf("%d", &n);

rem=n%2;

if (rem==0)

printf("the number %d is an even numbern", n);

if (rem!=0)

printf("the number %d is an odd number!n", n);

}

判断函数奇偶

if (a

{ t = a；a = b；b = t；}

A b 互换

#include

void main( )

{ int score, grade;

printf("Input a score(0~100): ");

scanf("%d", &score);

grade = score/10; //将成绩整除10，转化成switch语句中的case标号

switch (grade)

{ case 10:

case 9: printf("grade=An"); break; //标号10和9，都执行本行的这条语句

case 8: printf("grade=Bn"); break;

case 7: printf("grade=Cn"); break;

case 6: printf("grade=Dn"); break;

case 5:

case 4:

case 3:

case 2:

case 1:

case 0: printf("grade=En"); break;//标号5、4、3、2、1和0都执行本行的这条语句

default: printf("The score is out of range!n"); }//成绩超出范围时，提示出错

}

Switch语句经典利用 求考试分数等级

#include

void main(){

int year;

printf(“请输入年号：n ”);

scanf(“%d”, &year);

if ((year%4==0&&year%100!=0) ||year%400==0))

printf(“%d is a leap yearn”,year);

else printf(“%d is not a leap yearn”,year);

}

判断闰年？

#include

void main()

{ char ch;

scanf ("%c", &ch);

while (ch!= '!’)

{

if ((ch>='a' && ch<='z')||(ch>='A' && ch<='Z'))

{ if(ch == 'z') ch='a';

else if(ch == 'Z') ch='A';

else ch=ch+1;

}

printf ("%c", ch);

scanf ("%c", &ch);

}

printf ("字符串结束n");

}

字母+ 1 例如A到B C到D

#include

void main() {

int i，j，m；

printf(“*”)；

for(i=1；i<=9；i ++ )

printf(“ % 4d”，i)；

printf(“n”)；

for(i=1；i<=9；i ++ ){

printf(“ % d”，i)；

for(j=1；j<=i；j ++ ) {

m=i*j；

printf(“ % 4d”，m)； }

printf(“n”)； } }99 乘法表

#include

void main(){????int n;????for( n=100; n<=200; n++)

{?????if(n%7!=0) continue; //结束本次循环?????printf("%5d?