Dynamically allocated array - C Array

C examples for Array:Array Value

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Description

Dynamically allocated array

Demo Code

#include <stdio.h>
#include <stdlib.h> /* for malloc(), free() */

int main(void){
    double * ptd;
    int max;//from   w w  w . j a v  a 2 s.  c o  m
    int number;
    int i = 0;
    
    puts("What is the maximum number of type double entries?");
    
    if (scanf("%d", &max) != 1){
        puts("Number not correctly entered -- bye.");
        exit(EXIT_FAILURE);
    }
    ptd = (double *) malloc(max * sizeof (double));
    
    if (ptd == NULL){
        puts("Memory allocation failed. Goodbye.");
        exit(EXIT_FAILURE);
    }

    puts("Enter the values (q to quit):");
    while (i < max && scanf("%lf", &ptd[i]) == 1)
        ++i;

    printf("Here are your %d entries:\n", number = i);

    for (i = 0; i < number; i++){
        printf("%7.2f ", ptd[i]);
        if (i % 7 == 6)
            putchar('\n');
    }
    if (i % 7 != 0)
        putchar('\n');
    puts("Done.");
    free(ptd);
    
    return 0;
}

Result


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