/* https://cs.widener.edu/~yanako/html/courses/Spring25/csci152/a8e2.html
problem 1 solution */


#include<stdio.h>
#include<stdlib.h>
#include<time.h>

void print_char(char, int, int);
float ave_div_5();
int string_value(int);
void menu(int);

int main(){
	srand(time(NULL));
	int choice=rand()%5; //random numbers between 0 and 4
	printf("choice is %d\n",choice);
	menu(choice);
	return 0;
}

void print_char(char ch, int n, int m){
	int i,j;
	for(i=0;i<n; i++){
		for(j=0;j<m;j++){
			printf("%c",ch);
		}
		printf("\n");
	}
}
float ave_div_5(){
	int num, sum=0, count=0;
	printf("enter a sequence of positive ints\n");
	scanf("%d",&num);
	while(num>0){
		if(num%5==0){
			sum+=num;
			count++;
		}
		scanf("%d",&num);
	}
	if(count>0)
		return (float)(sum)/count;
	else
		return -1.0;
}
int string_value(int size){
	char ch;
	int sum=0,i, temp;
	printf("enter %d chars\n",size);
	for(i=0;i<size;i++){
		scanf("%c",&ch);
		if((ch>='a' && ch<='z')|| (ch>='A' && ch<='Z'))
			sum+=(int)(ch);
		else if(ch>='0' && ch<='9'){
			temp=(int)(ch)-(int)('0');
			sum+=temp;
		}
		else
			sum+=-1;
	}
	return sum;
}
void menu(int choice){
	int n,m, size;
	char ch;
	switch(choice){
		case 1:
			printf("printing rectangle of characters, enter char\n");
			n=3+rand()%(5-3+1);
			m=3+rand()%(5-3+1);
			scanf("%c",&ch);
			print_char(ch, m, n);
			break;
		case 2:
			 float result = ave_div_5();
			if(result==-1)
				printf("no divisible by 5\n");
			else
				printf("ave div by 5 is %f\n",result);
			break;
		case 3:
			size=5+rand()%(20-5+1);
			printf("string sum %d\n", string_value(size));
			break;
		default:
			printf("invalid input\n");
			break;
	}
}