[c] 구구단 출력 예제 3가지!

(1)

#include <stdio.h>

int main(){

	int i,a,b;

	printf("How far should I print the multiplication table?");
	scanf("%d",&i);
	
	for(b=2;b<=i;b++){
		for(a=1;a<=9;a++){

			printf("%d X %d = %d \n",b,a,b*a);

			}
		printf("\n");
	}
	return 0;

}

 

실행 결과

 

 

 

(2)

 

#include <stdio.h>
#include <ctype.h>

int main()
{
	char i;
	int j;
	
	printf("What number of multiplication tables would you like to print?");
	scanf("%c",&i);
	
	if(isdigit(i) != 0)
		for(j=1; j<=9; j++)
			printf("%d X %d = %d\n",(i-48),j,(i-48)*j);
	else
		printf("Please enter an integer.");
	
	return 0;
}

 

실행 결과

 

(3)

#include <stdio.h>
#include <unistd.h>

int main(void){
    int i=1,j=1,k;

    printf("Print the multiplication table.\n\n");

    for(i=1;i<10;i+=3){
		for(j=1;j<10;j++){
		    for(k=i;k<i+3;k++){
				printf(" %d x %d = %d\t", k,j,j*k);
	   		}
	   		printf("\n");
		}
		printf("\n");
    }
	return 0;
}

 

실행 결과