Some C program for practice

Predict the output or error(s) for the following:


C aptitude 1.1

void main() {             int  const * p=5;             printf("%d",++(*p)); }

Explanation: p is a pointer to a "constant integer". But we tried to change the value of the "constant integer".

C aptitude 1.2

main() {             char s[ ]="man";             int i;             for(i=0;s[ i ];i++)             printf("\n%c%c%c%c",s[ i ],*(s+i),*(i+s),i[s]); }

Explanation: s[i], *(i+s), *(s+i), i[s] are all different ways of expressing the same idea. Generally array name is the base address for that array. Here s is the base address. i is the index number/displacement from the base address. So, indirecting it with * is same as s[i]. i[s] may be surprising. But in the case of C it is same as s[i].

C aptitude 1.3

main() {             float me = 1.1;             double you = 1.1;             if(me>=you)               printf("I love U");              else                         printf("I hate U"); }