Introduction To Programming in C | NPTEL | Week 2 Assignment Solutions

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Introduction To Programming in C NPTEL 2022 Week 2 Assignment Solutions

Week 2: Question 1

#include<stdio.h>
int main() {
  
  int N, val, lower = 1, upper = 1;
  scanf("%d", &N);
  
  for(int i=0; i<N; i++) {
    for(int j=0; j<N; j++) {
      scanf("%d", &val);
      
      if(i>j && val!=0)
        upper = 0;
      if(i<j && val!=0)
        lower = 0;   
    }
  }
  
  if((upper == 1) && (lower == 1))
    printf("2");
  else if(upper == 1)
    printf("1");
  else if(lower == 1)
    printf("-1");
  else
    printf("0");
    
  return 0;
}

Week 2: Question 2

You are given a sorted(either in the increasing or in the decreasing order) sequence of positive numbers, ending with a -1. You can assume that there are atleast three numbers before the ending -1. 
Note : -1 is not a part of input. It only signifies that input has ended.

Let us call the sequence x0  x1 … xn -1.

You have to output 1 if there are at least three distinct numbers in the sequence.
otherwise output 0
Kindly do not use arrays in the code.

#include<stdio.h>

int main() {
  int num, count = 0;
  scanf("%d", &num);
  
  while(num!=-1) {
    int x, y;
    x = num;
    scanf("%d", &num);
    y = num;
    if((x!=y) && (num!=-1))
      count++;
  }
  if(count >= 2)
    printf("1");
  else
    printf("0");
  
  return 0;
}

Week 2: Question 3

You are given a non-negative sequence of numbers, ending with a -1. You can assume that there are at least two numbers before the ending -1. 
Note : -1 is not a part of input. It only signifies that input has ended.
Let us call the sequence x0  x1 … xn -1.
You have to output the second largest element of the sequence. if there is no second largest element in the sequence then output 0.

Kindly do not use arrays in the code.

#include<stdio.h>

int main() {
  int num, num1, num2;
  scanf("%d", &num);
  num1 = num;
  num2 = 0;
  while(num!=-1) {
    scanf("%d", &num);
    if(num1 < num) {
      num2 = num1;
      num1 = num;
    }
  }
  if(num2 != 0)
    printf("%d", num2);
  else
    printf("0");
  
  return 0;
}

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