#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 100
//ham kien tra ky tu xuat hien trong chuoi va lan xuat hien
int ktXuatHien(char a[], char s){
int dem = 0;
for (int i = 0; i < strlen(a) / 2; i++)
{
if (a[i] == s)
{
dem++;
}
}
if (dem > 0)
{
printf("Ky tu '%c' co xuat hien trong chuoi va xuat hien %d lan.", s, dem);
}else{
printf("Ky tu '%c' khong xuat hien trong chuoi.", s);
}
}
int main(){
system("cls");
char a[MAX], s;
printf("nhap vao chuoi: ");
gets(a);
printf("Nhap vao ky tu cau tim: ");
scanf("%c", &s);
ktXuatHien(a, s);
return 0;
}