#include #include #include /** * An old homework problem I dug out of my * vault: Build a numerical 'X' using digits * 1-9. * Notes: For best results, stick to values * 1-9. * Numbers out of range won't cause an error, * but will be adjusted to the proper range. * If nothing is entered or there's invalid * input, a number will be chosen at random. */ int main() { srand(time(NULL)); int i, j, height; printf("Enter height: "); //Use default value if no number read if(scanf("%d", &height)<1) { height = (rand()%10) + 1; height = height > 9 ? height-1 : height; } //handle numbers out of range if(!height || !(height%10)) height = (rand()%10) + 1; if(height < 0 && height > -10) height *= -1; if(height < -9) height = (rand()%10) + 1; if(height > 9) height %= 10; printf("\n"); /* The key to understanding this design * is recognition of the shape of an 'X' * There's a top portion \/ and a bottom * portion /\. This implementation builds * these separately. */ // Top portion of X for(i=1; i0; i--) { // trailing spaces for(j=1; j

NumericalX