C kiritilgan ma’lumotni tekshirish
Kiritilgan ma’lumotni tekshirish
Foydalanuvchilar C dasturiga ma’lumot kiritganda kutilmagan narsani yozib qo‘yishlari mumkin. Kiritilgan ma’lumotni tekshirish dastur ishini davom ettirishidan oldin ma’lumot to‘g‘ri ekanligiga ishonch hosil qiladi.
Tekshiruvsiz dasturingiz ishdan chiqishi yoki noto‘g‘ri natija berishi mumkin!
Quyidagi misollarda C tilida foydalanuvchi kiritgan ma’lumot to‘g‘ri ekanligini tekshirishning oddiy usullari ko‘rsatilgan.
Son oralig‘ini tekshirish
Son ruxsat etilgan oraliqda (masalan, 1 dan 5 gacha) ekanligini tekshiring:
Misol
#include <stdio.h>
int main() {
int number; // Variable to store the user's number
do {
printf("Choose a number between 1 and 5: ");
scanf("%d", &number); // Read number input
while (getchar() != '\n'); // Clear leftover characters from input buffer
} while (number < 1 || number > 5); // Keep asking until number is between 1 and 5
printf("You chose: %d\n", number); // Print the valid number
return 0;
}
Natija namunasi:
Choose a number between 1 and 5: 8
Choose a number between 1 and 5: -2
Choose a number between 1 and 5: 4
You chose: 4
Matnli kiritishni tekshirish
Ism bo‘sh emasligini tekshiring. fgets() funksiyasidan foydalaning va birinchi belgini tekshiring:
Misol
#include <stdio.h>
#include <string.h>
int main() {
char name[100]; // Buffer to store the user's name
do {
printf("Enter your name: ");
fgets(name, sizeof(name), stdin); // Read input as a string
name[strcspn(name, "\n")] = 0; // Remove the newline character if present
} while (strlen(name) == 0); // Repeat if the input is empty
printf("Hello, %s\n", name); // Greet the user
return 0;
}
Natija namunasi:
Enter your name:
Enter your name:
Enter your name: John
Hello, John
Butun son kiritilishini tekshirish
Foydalanuvchi son kiritganiga ishonch hosil qiling. Agar u boshqa narsa (masalan, harf) kiritsa, fgets() va sscanf() yordamida qaytadan so‘rang:
Misol
#include <stdio.h>
int main() {
int number; // Variable to store the user's number
char input[100]; // Buffer to hold user input as a string
printf("Enter a number: ");
// Keep reading input until the user enters a valid integer
while (fgets(input, sizeof(input), stdin)) {
// Try to read an integer from the input string
if (sscanf(input, "%d", &number) == 1) {
break; // Success: break out of the loop
} else {
printf("Invalid input. Try again: "); // If not an integer, ask again
}
}
// Print the valid number entered by the user
printf("You entered: %d\n", number);
return 0;
}
Natija namunasi:
Enter a number: AB
Invalid input. Try again: 3.5
Invalid input. Try again: 35
You entered: 35
Maslahat: fgets() va sscanf() haqida batafsil ma’lumotni <stdio.h> kutubxonasi ma’lumotnomamizda o‘qishingiz mumkin.
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