Length Of Array In C

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This example program demonstrates how to get the length of a C array using the sizeof operator.

#include <stdio.h> int int_array[5]; double double_array[10]; char char_array[] = {'a', 'b', 'c', 'd'}; int main () { const char * format = "The %s array has %d bytes and %d elements.\n"; printf (format, "int", sizeof (int_array), sizeof (int_array) / sizeof (int)); printf (format, "double", sizeof (double_array), sizeof (double_array) / sizeof (double)); /* This method works even when the size of the array is not specified in the initializer. */ printf (format, "char", sizeof (char_array), sizeof (char_array) / sizeof (char)); return 0; }

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It outputs the following:

The int array has 20 bytes and 5 elements. The double array has 80 bytes and 10 elements. The char array has 4 bytes and 4 elements.
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