B2.cpp

#include <stdio.h>
#include <string.h>

void nhap(char c[]){
	char ch;
	int i = 0;
	do{
		scanf("%c",&ch);
		if(ch != 'k'){
			c[i] = ch;
			i++;
		}
	}while(ch != 'k');
}

void in(char c[]){
	printf("%s",c);
}

void dem(char c[]){
	int l = strlen(c);
	int dem = 0;
	for(int i = 0;i < l;i++){
		if(c[i] == 'c') dem++;
	}
	printf("\nSo ky tu c trong chuoi: %d",dem);
}

void chen(char c[]){
	c[strlen(c)] = 'z';
	printf("\nChuoi sau khi chen: ");
	in(c);
}

int main(){
   char c[1000];
   nhap(c);
   in(c);
   dem(c);
   chen(c);
}