View Compilation Error

0_0_2914979_15177.c:3: error: syntax error before '&' token
0_0_2914979_15177.c: In function `chr_add':
0_0_2914979_15177.c:5: error: `a' undeclared (first use in this function)
0_0_2914979_15177.c:5: error: (Each undeclared identifier is reported only once
0_0_2914979_15177.c:5: error: for each function it appears in.)
0_0_2914979_15177.c:5: error: `tag' undeclared (first use in this function)
0_0_2914979_15177.c: At top level:
0_0_2914979_15177.c:15: error: syntax error before '&' token
0_0_2914979_15177.c:16: error: redefinition of 'chr_add'
0_0_2914979_15177.c:4: error: previous definition of 'chr_add' was here
0_0_2914979_15177.c: In function `chr_add':
0_0_2914979_15177.c:17: error: `a' undeclared (first use in this function)
0_0_2914979_15177.c:17: error: `b' undeclared (first use in this function)
0_0_2914979_15177.c:17: error: `tag' undeclared (first use in this function)