Patni Sample Technical - C & C++

1. #include
   /* This problem is given in PCS BOMBAY walk-in-interview.
   * What is the final value of i and how many times loop is
   * Executed ?
   */
   
   main()
   
   {
   int i,j,k,l,lc=0;
   /* the input is given as 1234 567 */
   printf("Enter the number string:<1234>\n");
   scanf("%2d%d%1d",&i,&j,&k);
   for(;k;k--,i++)
   for(l=0;l> printf("%d %d\n",i,l);}
   printf("LOOPS= %d\n", lc-1);
   }
   /* Ans: i = 17, and loop is executed for 169 times */

2. #include
   main()
   {
   func(1);
   }
   func(int i){
   static char *str[] ={ "One","Two","Three","Four"};
   printf("%s\n",str[i++]);
   return;
   }
   /* Ans:- it will give warning because str is pointer to the char but
   it is initialized with more values
   if it is not considered then the answer is Two */

3. #include
   main()
   {
   int i;
   for (i=1;i<100; i++)
   printf("%d %0x\n",i,i);
   }
   /* Ans:- i is from 1 to 99 for the first format,
   for the second format 1to9, ato f, 10 to 19,1ato1f, 20 to 29, etc */

4. #include
   /* This problem was asked in PCS Bombay in a walk-in-interview
   * Write a recursive function that calculates
   * n * (n-1) * (n-2) * ....... 2 * 1
   */
   
   main() {
   int factorial(int n);
   int i,ans;
   printf("\n Enter a Number:");
   scanf("%d",&i);
   ans = factorial(i);
   printf("\nFactorial by recursion = %d\n", ans);
   }
   int factorial(int n)
   {
   if (n <= 1) return (1);
   else
   return ( n * factorial(n-1));
   }

5. #include
   /* This problem is asked in PCS Bombay walk-in-interview
   * What is the output of the following problem
   */
   main(){
   int j,ans;
   j = 4;
   ans = count(4);
   printf("%d\n",ans);
   }
   int count(int i)
   {
   if ( i < 0) return(i);
   else
   return( count(i-2) + count(i-1));
   }
   
   /* It is showing -18 as an answer */

6. #include
   /* This problem is given in PCS BOMBAY walk-in-interview.
   * What is the final value of i and how many times loop is
   * Executed ?
   */
   
   main()
   
   {
   int i,j,k,l,lc=0;
   /* the input is given as 1234 567 */
   printf("Enter the number string:<1234>\n");
   scanf("%2d%d%1d",&i,&j,&k);
   for(;k;k--,i++)
   for(l=0;l> printf("%d %d\n",i,l);}
   printf("LOOPS= %d\n", lc-1);
   }
   /* Ans: i = 16, and loop is executed for 169 times */