<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 

//i를1에서19까지홀수만을표시하는프로그램을작성하시오(!= 연산자를이용)

#include < stdio.h >

void main()

{

        int i;

        for(i=1; i <20 ; i++)

        {

               if( i % 2 != 0 )

                       printf("%d ", i ) ;

        }

}

//a=5,b=3 인경우a+b-b²이양수이면그결과를표시하고음수이면- 라표시하는프로그램을작성하시오.

#include < stdio.h >

#include < math.h >

void main()

{

        int a = 5 , b = 3;

        int x ;

        x = a + b - ((int)pow(b,2));

        if( x > 0 )

               printf("%d \n" , x ) ;

        else

               printf("-\n");

}

//2개의정수를a,b에입력하여a>=b일때c에곱을구하여표시하고, a<b일때c에b/a를구하여표시하는프로그램을작성하시오.(단,a=/0이다)

#include < stdio.h >

void main()

{

        int a, b , c;

        do

        {

               printf("a : " );       scanf("%d", &a) ;

        }while( a == 0 );

        printf("b : " );       scanf("%d", &b ) ;

        if( a >= b )           c = a * b;

        else if( a < b )       c = b / a ;

        printf("\n\n결과: %d \n" , c ) ;

}

//0이입력될때까지데이터를입력받아서홀수와짝수의개수를구하는프로그램을작성하시오

#include < stdio.h >

void main()

{

        int num[100];

        int i = 0 ;

        int temp;

        int x = 0 ;

        int y = 0 ;

        printf("입력: " );

        while(1)

        {

               scanf("%d", &temp ) ;

               if( temp == 0 ) break;

               num[i] = temp;

               if( num[i++] % 2 != 0 )               x++;

                else                                         y++;

        }

        printf("홀수: %d \n짝수: %d \n" , x , y ) ;

}

//100이하의난수를50개발생시켜5의배수의개수를구하는프로그램을작성하시오.한줄에10개씩출력되도록하시오

#include < stdio.h >

#include < stdlib.h >

#include < time.h >

void main()

{

        int num[50];

        int i;

        int nCount =0 ;

        // 시드값초기화

        srand( (unsigned int) time ( NULL ) ) ;

        for(i=0 ; i < 50 ; i++)

        {

               num[i] = rand()%98+1 ; // 1~99까지의랜덤숫자생성

               if( num[i] % 5 == 0 ) nCount++;       // 5의배수이면은nCount를증가한다

        }

        // 화면에출력해준다.

        for(i=1 ; i <= 50 ; i++)

        {

               printf("%2d  ", num[i-1] );

               if( i % 10 == 0 ) printf("\n");

        }

        printf("\n\n5의배수의갯수: %d \n" , nCount ) ;

}