Eroare de compilare: user.c: In function ‘expo’: user.c:21:18: error: ‘MOD’ undeclared (first use in this function) return a%MOD; ^ user.c:21:18: note: each undeclared identifier is reported only once for each function it appears in 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] } ^ user.c: In function ‘main’: user.c:43:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &A); ^ user.c:44:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &B); ^ user.c:45:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%lld", &C); ^