View Compilation Error

0_0_11647486_15205.c:17: error: syntax error before "double"
0_0_11647486_15205.c: In function `walk':
0_0_11647486_15205.c:20: error: 'for' loop initial declaration used outside C99 mode
0_0_11647486_15205.c:29: error: 'for' loop initial declaration used outside C99 mode
0_0_11647486_15205.c:31: error: 'for' loop initial declaration used outside C99 mode
0_0_11647486_15205.c:34: error: 'for' loop initial declaration used outside C99 mode
0_0_11647486_15205.c:45: error: redefinition of 'i'
0_0_11647486_15205.c:29: error: previous definition of 'i' was here
0_0_11647486_15205.c:45: error: 'for' loop initial declaration used outside C99 mode
0_0_11647486_15205.c: In function `main':
0_0_11647486_15205.c:71: error: 'for' loop initial declaration used outside C99 mode