Build a complete dynamic array instance using C language, dynamic array

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This article uses a complete example code to briefly describe how to build a dynamic array in C language for your reference. The complete example is as follows:

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#include <stdio.h>#include <malloc.h>int main(void) {    int len;    int * arr;    printf("Enter the length of the array :");    scanf("%d", &len);    arr = (int *)malloc(sizeof(int)*len);    printf("Enter the value of the array :");    for ( int i = 0; i < len; i ++) {        scanf("%d", &arr[i]);    }    for (int j = 0; j < len; j ++) {        printf("%d:%d ", j , arr[j]);    }    free(arr);    return 0;}

The running result is as follows:

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E:\clearning\cpointer>gcc dynamicarray.c -o dm --std=c99E:\clearning\cpointer>dmEnter the length of the array: 5Enter the value of the array: 1 2 3 4 50:1 1:2 2:3 3:4 4:5