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#include <stdio.h> int main( void ) { int build = 0; FILE* f; FILE* g; f = fopen( "build.h", "r" ); fscanf( f, "#define __BUILD %d", &build ); fclose( f ); g = fopen( "build.h", "w" ); fprintf( g, "#define __BUILD %d\n", ++build ); fclose( g ); }