C examples for Data Type:Random Number
Generating Pseudo-Random Integers
#include <stdio.h> #include <stdlib.h> // For rand() and srand() #include <time.h> // For time() function int main(void) { int chosen = 0; // The lucky number int guess = 0; // Stores a guess int count = 3; // The maximum number of tries int limit = 20; // Upper limit for pseudo-random values srand(time(NULL)); // Use clock value as starting seed chosen = 1 + rand() % limit; // Random int 1 to limit for( ; count > 0 ; --count){ printf("\nYou have %d tr%s left.", count, count == 1 ? "y" : "ies"); printf("\nEnter a guess: "); // Prompt for a guess scanf("%d", &guess); // Read in a guess // Check for a correct guess if(guess == chosen) {/*from ww w .jav a2s . com*/ printf("\nYou guessed it!\n"); return 0; // End the program } else if(guess < 1 || guess > 20) // Check for an invalid guess printf("I said the number is between 1 and 20.\n "); else printf("Sorry, %d is wrong. My number is %s than that.\n", guess, chosen > guess ? "greater" : "less"); } printf("\nYou have had three tries and failed. The number was %ld\n", chosen); return 0; }