sizeof 和 memset

// Example of the sizeof keywordsize_t i = sizeof( int ); struct align_depends { char c; int i;};size_t size = sizeof(align_depends); // The value of size depends on // the value set with /Zp or // #pragma packint array[] = { 1, 2, 3, 4, 5 }; // sizeof( array ) is 20 // sizeof( array[0] ) is 4 size_t sizearr = // Count of items in array sizeof( array ) / sizeof( array[0] );

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/* MEMSET.C: This program uses memset to * set the first four bytes of buffer to "*". */#include <memory.h>#include <stdio.h>void main( void ){ char buffer[] = "This is a test of the memset function"; printf( "Before: %s/n", buffer ); memset( buffer, '*', 4 ); printf( "After: %s/n", buffer );}

输出：

Before: This is a test of the memset function
After:  **** is a test of the memset function