# Introduction to programming in C Week 2

**Course Name: Introduction to programming in C**

**Course Link: Click Here**

**These are Introduction to programming in C Assignment 2 Answers**

**Question 1**

#### 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.

You have to output the second largest element of the sequence.

If there is no second largest element in the sequence then output 0.

Note : -1 is not a part of input. It only signifies that input has ended.

**Solution:**

```
#include <stdio.h>
int second_largest(int n, int numbers[n])
{
int largest = numbers[0];
for (int i = 1; i < n; i++){
if (numbers[i] > largest){
largest = numbers[i];
}
}
int second_largest = 0;
for (int i = 0; i < n; i++) {
if (numbers[i] < largest && numbers[i] > second_largest) {
second_largest = numbers[i];
}
}
return second_largest;
}
int main() {
int numbers[100];
int n = 0;
while (1) {
int number;
scanf("%d", &number);
if (number == -1) {
break;
}
numbers[n++] = number;
}
int result = second_largest(n, numbers);
printf("%d", result);
return 0;
}
```

**These are Introduction to programming in C Assignment 2 Answers**

**Question 2**

**You are given a non decreasing sorted sequence of non negative integers, ending with -1.That is if the sequence is a1,a2,…,an,−1 then ai≤ai+1 for all i from 1 to n-1.You can assume that are at least two numbers before the ending -1.You have to output the number of distinct elements in the sorted sequence.**

**Solution:**

```
#include <stdio.h>
int main(){
int num, m, n, counter=0;
scanf("%d",&num);
while(num!=-1){
m=num;
scanf("%d",&num);
n=num;
if((m!=n) && (num!=-1))
counter++;
}
if(counter>=0)
printf("%d",counter+1);
else
printf("0");
return 0;
}
```

**These are Introduction to programming in C Assignment 2 Answers**

**Question 3**

**In this assignment, you will be given an N×N matrix, with N>1You have to determine whether the matrix is an upper triangular matrix.A matrix is upper triangular if every entry below the diagonal is 0. The following is an example of an upper triangular matrix:Note: The diagonal itself, and the entries above the diagonal can be zeroes or non-zero integers.InputFirst, you will be given N, which is the size of the matrix.Then you will be given N rows of integers, where each row consists of N integers separated by spaces.OutputIf the input matrix is upper triangular, then print 1. Otherwise, print 0.**

**Solution:**

```
#include <stdio.h>
int main(){
int n,i,j,a,up=0,lp=0;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
{
scanf("%d",&a);
if(i>j)
{
if(a!=0)
up=1;
}
else if(i<j)
{
if(a!=0)
lp=1;
}
}
}
if(up==0|lp==0)
printf("1");
else
printf("0");
return 0;
}
```

**These are Introduction to programming in C Assignment 2 Answers**

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**These are Introduction to programming in C Assignment 2 Answers**