View Compilation Error

0_0_6592070_22167.c:4: error: syntax error before "mod"
0_0_6592070_22167.c:4: error: syntax error before "a"
0_0_6592070_22167.c:5: error: syntax error before "mod"
0_0_6592070_22167.c:5: error: syntax error before "a"
0_0_6592070_22167.c: In function `mod':
0_0_6592070_22167.c:7: error: `a' undeclared (first use in this function)
0_0_6592070_22167.c:7: error: (Each undeclared identifier is reported only once
0_0_6592070_22167.c:7: error: for each function it appears in.)
0_0_6592070_22167.c:8: error: `b' undeclared (first use in this function)
0_0_6592070_22167.c: At top level:
0_0_6592070_22167.c:11: error: syntax error before "ans"