View Compilation Error

0_0_11034354_27500.c: In function `main':
0_0_11034354_27500.c:15: error: `true' undeclared (first use in this function)
0_0_11034354_27500.c:15: error: (Each undeclared identifier is reported only once
0_0_11034354_27500.c:15: error: for each function it appears in.)
0_0_11034354_27500.c:24: error: 'for' loop initial declaration used outside C99 mode
0_0_11034354_27500.c: In function `add':
0_0_11034354_27500.c:32: error: 'for' loop initial declaration used outside C99 mode