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#include <stdio.h>
 
#define ERROR_CODE_1 1
int err = 0;
 
//A disaster occurs!
 
err = ERROR_CODE_1;
 
switch(err){
 
    case 1:
 
        printf("Testing special case error handling now. ");
    default:
 
        printf("Testing basic error handling now.");
        break;
}

prog.c:8:1: warning: data definition has no type or storage class
 err = ERROR_CODE_1;
 ^~~
prog.c:8:1: warning: type defaults to ‘int’ in declaration of ‘err’ [-Wimplicit-int]
prog.c:8:1: error: redefinition of ‘err’
prog.c:4:5: note: previous definition of ‘err’ was here
 int err = 0;
     ^~~
prog.c:10:1: error: expected identifier or ‘(’ before ‘switch’
 switch(err){
 ^~~~~~

Standard output is empty