Dynamic (re)size array

Dynamic (re)size array #include <stdio.h> #include <stdlib.h> int main(void) { int *a; int i = 5; if((a = (int *)malloc(i * sizeof(int))) == NULL) { fprintf(stderr, "Error: failed malloc\n"); return 1; } for(i = 0; i < 5; i++) a[i] = i; printf("-- array after malloc\n"); for(i = 0; i < 5; i++) printf(" a[%d] = %d\n", i, a[i]); if((a = (int *)realloc(a, i * sizeof(int))) == NULL) { fprintf(stderr, "Error: failed realloc\n"); return 1; } for(i = 0; i < 10; i++) a[i] = i; printf("\n-- array after realloc\n"); for(i = 0; i < 10; i++) printf(" a[%d] = %d\n", i, a[i]); free(a); return 0; }