Eroare de compilare: user.c: In function ‘expo’: user.c:21:18: error: ‘c’ undeclared (first use in this function) return a%c; ^ user.c:21:18: note: each undeclared identifier is reported only once for each function it appears in user.c:26:9: error: too many arguments to function ‘expo’ return expo(expo(a, b/2), 2, c) % c; ^ user.c:18:11: note: declared here long long expo(long long a, long long b){ ^ user.c:29:9: error: too many arguments to function ‘expo’ return multi(a, expo(expo(a, (b-1)/2, c), 2, c)%c)%c, c) %c; ^ user.c:18:11: note: declared here long long expo(long long a, long long b){ ^ user.c:29:9: error: too many arguments to function ‘expo’ return multi(a, expo(expo(a, (b-1)/2, c), 2, c)%c)%c, c) %c; ^ user.c:18:11: note: declared here long long expo(long long a, long long b){ ^ user.c:29:9: error: too few arguments to function ‘multi’ return multi(a, expo(expo(a, (b-1)/2, c), 2, c)%c)%c, c) %c; ^ user.c:3:11: note: declared here long long multi(long long a, long long b, long long c){ ^ user.c:29:61: warning: left-hand operand of comma expression has no effect [-Wunused-value] return multi(a, expo(expo(a, (b-1)/2, c), 2, c)%c)%c, c) %c; ^ user.c:29:64: error: expected ‘;’ before ‘)’ token return multi(a, expo(expo(a, (b-1)/2, c), 2, c)%c)%c, c) %c; ^ user.c:29:64: error: expected statement before ‘)’ token user.c:29:66: error: expected expression before ‘%’ token return multi(a, expo(expo(a, (b-1)/2, c), 2, c)%c)%c, c) %c; ^ user.c: In function ‘main’: user.c:49:1: error: too many arguments to function ‘expo’ fprintf(file2, "%lld", expo(A, B, C)); ^ user.c:18:11: note: declared here long long expo(long long a, long long b){ ^ user.c: In function ‘expo’: user.c:31:1: warning: control reaches end of non-void function [-Wreturn-type] } ^