View Compilation Error

0_0_8334023_13261.c:5: error: syntax error before "char"
0_0_8334023_13261.c: In function `fun':
0_0_8334023_13261.c:23: error: `c2' undeclared (first use in this function)
0_0_8334023_13261.c:23: error: (Each undeclared identifier is reported only once
0_0_8334023_13261.c:23: error: for each function it appears in.)
0_0_8334023_13261.c: In function `main':
0_0_8334023_13261.c:55: error: `c2' undeclared (first use in this function)