modulotable.c

#include <stdio.h>


int main(int argc, char **argv)
{
	int i=0,j=0,temp=0,mod=0,flag=0;
    
    printf("[0] +\n[1] *\nselect operator: ");
    scanf("%d", &flag);
    
    printf("modulo value: ");
    scanf("%d", &mod);
    
	printf("\n\n\t");
	
	for( j = 0; j < mod; j++){
		printf("%d\t", j);
	}
	
	printf("\n");
	
    for( i = 0; i < mod; i++){ // column-loop
		printf("%d\t", i);
        for( j = 0; j < mod; j++){ // row-loop
            if( flag == 0 ){
                temp = ( i + j ) % mod;
            } else if( flag == 1 ){
                temp = ( i * j ) % mod;
            }
            if( ( temp == 1 && flag == 1 ) || ( temp == 0 && flag == 0 ) ){
                printf("\x1B[31m");
            }
            printf("%d", temp);
            printf("\x1B[0m");
            printf("\t");
        }
		printf("\n");
    }
    
	printf("\n\n");
	
	return 0;
}