for the first question...it will take #ifdef getchar to be '1' only when it is defined as a MACRO in your program..if u dont define macro it will not take it into consideration even if it is defined in header file.
On Mon, Jul 11, 2011 at 12:38 AM, nicks <[email protected]> wrote: > Someone please help me in understanding the following output - > > Problem *1>.* > #include<stdio.h> > #ifdef getchar //this expression is evaluated to zero.....why is so > happening ??........getchar is defined as macro in stdio.h.....i mean else > part shouldn't be executed which is happening > #undef getchar > #else > #define getchar scanf("%c",&ch); > #endif > main() > { > char ch; > int c; > c=getchar; > printf("%d",c); > } > > *OUTPUT- 1* > * > * > * > * > *2>.* > #include<stdio.h> > void main() > { > long x; > float t; > scanf("%f",&t); > printf("%d\n",t); > x=90; > printf("%ld\n",x); > { > x=1; > printf("%f\n",x); > { > x=30; > printf("%f\n",x); > } > printf("%f\n",x); > } > x==9; > printf("%f\n",x); > } > > *OUTPUT(INPUT IS 2) -* > *2* > *0* > *90* > *2.000000* > *2.000000* > *2.000000* > *2.000000* > * > * > In this problem i failed to Understand why t is printed as 0 (though float > is converted to integer by truncation of the fractional part) > and how the value of t is transferred to x....looks very strange to me !! > > > *3>.* > #include<stdio.h> > main() > { > printf("\nACM-CIC"+3); > printf(4+"\nACM-CIC"); > > } > > *OUTPUT -* > *M-CIC-CIC* > * > * > What does +3 and +4 doing and does it matter to use them before the format > string or after it ?? > > *4>.* > #include<stdio.h> > main() > { > long long i=50; > i==1000000000000000000000000000000000000000; > printf("i=%d\n\n%lld",sizeof(i),i); > //system("pause"); > } > > *OUTPUT -* > *i=8* > * > * > *50* > * > * > Assigning very large value to i isn't changing it's value.....why is so > happening ?? > > and the last one > > *5>.* > #include<stdio.h> > main() > { > static int i=0; > if(i<=-1) > printf("\nBull's Eye"); > else > { > main(); > _exit(1); > } > i++; > } > > *OUTPUT -* > *segementation fault* > * > * > What's Wrong with the above Code due to which it is giving Runtime > error....plz help me pointing it out !! > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > -- Regards, Kamakshi [email protected] -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
