C programming Questions

C programming For Recent college graduates and professionals for job interview.:
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some small C programs are given asked to tell the function/errors etc.
one of the question(last in the paper) is an invalid statement. finish of all these very fast and think about those others. they are simple only.

1.

int a=2,b=3,c=4;
printf("a=%d,b=%d\n",a,b,c);

ANS:2,3

2.for(i=1;i<10;++i,printf("%d",i));+-
ANS:compiling error.

3.whole logic is given in func s but they are working properly. the main logic is :

char *string;

string=malloc(5*sizeof(char));
strcpy(string,"hello");
printf("%s",string); /* func to print */

ANS: hello and some extra characters until uccerence of \0 .

4. in a system integer takes 3bytes and char takes 1byte …….
struct smthing{

int a;
char b[4];
};

ANS : sizeof struct smithing is 7 bytes.