/* Write a function int count_change (char old_str[], new_str[]) 
that has two parameters, strings of characters. The function replaces all '$' 
characters with letter 'a'. 
Function counts and returns the number of replacements made.

Write main that reads 5 strings (use loop), for each string the function prints 
the string AFTER the function is called and the number of replacements made. */

#include<stdio.h>
#define SIZE_STR 20
int count_change(char old_str[], char new_str[]);
int main(){
	char old_str[SIZE_STR], new_str[SIZE_STR];
	printf("enter string \n");
	scanf("%s",old_str);
	printf("number of changes is %d\n",count_change(old_str,new_str));
	printf("old string %s\n",old_str);
	printf("new string %s\n", new_str);
	return 0;

}
int count_change(char old_str[], char new_str[]){
	int i=0, count=0;
	while(old_str[i]!='\0'){
		if(old_str[i]=='$'){
			new_str[i]='a';
			count++;
		}
		else{
			new_str[i]=old_str[i];
		}
		i++;
	}
	new_str[i]='\0';
	return count;
}