View Compilation Error

0_0_5142530_21536.c: In function `cal':
0_0_5142530_21536.c:7: error: 'for' loop initial declaration used outside C99 mode
0_0_5142530_21536.c:27: error: redefinition of 'i'
0_0_5142530_21536.c:7: error: previous definition of 'i' was here
0_0_5142530_21536.c:27: error: 'for' loop initial declaration used outside C99 mode
0_0_5142530_21536.c: In function `main':
0_0_5142530_21536.c:38: error: 'for' loop initial declaration used outside C99 mode