View Compilation Error

0_0_8781908_17401.c:4: error: syntax error before "namespace"
0_0_8781908_17401.c: In function `printStack':
0_0_8781908_17401.c:13: error: 'for' loop initial declaration used outside C99 mode
0_0_8781908_17401.c: In function `dfs':
0_0_8781908_17401.c:29: error: 'for' loop initial declaration used outside C99 mode
0_0_8781908_17401.c:30: error: syntax error before '/' token
0_0_8781908_17401.c: In function `main':
0_0_8781908_17401.c:46: error: 'for' loop initial declaration used outside C99 mode