View Compilation Error

0_0_9971998_20543.c:2:16: stack: No such file or directory
0_0_9971998_20543.c:4: error: syntax error before "namespace"
0_0_9971998_20543.c: In function `main':
0_0_9971998_20543.c:9: error: `stack' undeclared (first use in this function)
0_0_9971998_20543.c:9: error: (Each undeclared identifier is reported only once
0_0_9971998_20543.c:9: error: for each function it appears in.)
0_0_9971998_20543.c:9: error: syntax error before "int"
0_0_9971998_20543.c:17: error: `s' undeclared (first use in this function)