TECHFEST QUALIFYING ROUND

 #include int main(){

 int x;

 x=10,20,30;

 printf("%d",x);

 return 0;

 }

• 20

• 10

• 30

• ERROR

        #include int main()

{

        int a=2,b=7,c=10;

        c=a==b;

        printf("%d",c);

         return 0;

          }

• -1

• 0

• 1

• 11

int main() {

int arr[] = {1, 2, 4, 5, 6};

int n = 6;

int sum = n * (n + 1) / 2;

int actual_sum = 0;

for (int i = 0; i < n - 1; i++) {

actual_sum += arr[i];

}

int missing_number = sum - actual_sum;

printf("Missing number is %d\n", missing_number);

return 0;

}

• 5

• 4

• 3

• 2

int main() {

int arr[3][3] = {{1, 2, 3},{4, 5, 6},{7, 8, 9}};

int i, j;

for (i = 0; i < 3; i++) {

for (j = 0; j < 3; j++) {

printf("%d ", arr[i][j]);

}

printf("\n");

}

return 0;

• 7 8 9

  4 5 6

  1 2 3

• 3 2 1

  6 5 4

  9 8 7

• 1 4 7

  2 5 8

  3 6 9

• 1 2 3

  4 5 6

  7 8 9

int main() {

int n;

for(n = 7; n!=0; n--)

printf("n = %d", n--);

getchar();

return 0;

}

• Error

• n = 7

• Infinite Loop

• n = 6

int main(){

int i=0;

while ( +(+i--) != 0)

i-=i++;

printf("%d",i);

return 0;

}

• 0

• 1

• -1

• Error

int main(){

if (printf("cIsgood"))

printf("I know c");

else

printf("I know c++");

return 0;

}

• cIsgoodIknow c

• Error

• I know c++

• cIsgoodIknowc++

int main() {

int a[] = {1, 2, 3, 4, 5};

int *p = a;

p++;

printf("%d", *(p + 2));

return 0;

}

• 1

• 3

• 4

• 5

int main() {

int a[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

int (*p)[3] = a + 1;

printf("%d %d %d\n", (*p)[0], (*p)[1], (*p)[2]);

return 0;

}

• 4 5 6

• Undefined behavior

• 7 8 9

• 1 2 3

int main(){

float a=3.15529;

printf("%2.1f\n", a);

return 0;

}

• 3.1

• 3.16

• 3.1553

• 3.2