View Compilation Error

0_0_12769001_7571.c: In function `main':
0_0_12769001_7571.c:21: error: 'for' loop initial declaration used outside C99 mode
0_0_12769001_7571.c:24: error: redefinition of 'i'
0_0_12769001_7571.c:21: error: previous definition of 'i' was here
0_0_12769001_7571.c:24: error: 'for' loop initial declaration used outside C99 mode