View Compilation Error

0_0_2861450_11593.c:5: error: syntax error before "graph"
0_0_2861450_11593.c: In function `cal':
0_0_2861450_11593.c:16: error: `true' undeclared (first use in this function)
0_0_2861450_11593.c:16: error: (Each undeclared identifier is reported only once
0_0_2861450_11593.c:16: error: for each function it appears in.)
0_0_2861450_11593.c:26: error: `false' undeclared (first use in this function)
0_0_2861450_11593.c: In function `main':
0_0_2861450_11593.c:52: error: `true' undeclared (first use in this function)
0_0_2861450_11593.c:54: error: `false' undeclared (first use in this function)