View Compilation Error

0_0_5965211_28782.c: In function `main':
0_0_5965211_28782.c:4: error: `_int64' undeclared (first use in this function)
0_0_5965211_28782.c:4: error: (Each undeclared identifier is reported only once
0_0_5965211_28782.c:4: error: for each function it appears in.)
0_0_5965211_28782.c:4: error: syntax error before "test"
0_0_5965211_28782.c:6: error: `test' undeclared (first use in this function)
0_0_5965211_28782.c:7: error: `i' undeclared (first use in this function)
0_0_5965211_28782.c:9: error: `n' undeclared (first use in this function)
0_0_5965211_28782.c:9: error: `a' undeclared (first use in this function)
0_0_5965211_28782.c:9: error: `b' undeclared (first use in this function)
0_0_5965211_28782.c:10: error: `sum' undeclared (first use in this function)
0_0_5965211_28782.c:11: error: `t' undeclared (first use in this function)
0_0_5965211_28782.c:12: error: `j' undeclared (first use in this function)