View Compilation Error

0_0_9378950_20874.c: In function `powx':
0_0_9378950_20874.c:8: error: 'for' loop initial declaration used outside C99 mode
0_0_9378950_20874.c: In function `main':
0_0_9378950_20874.c:23: error: 'for' loop initial declaration used outside C99 mode