# Programming and Problem solving
### **PRACTICAL-1**
**Objective: Write a C program to evaluate an expression ax2 + bx + c.**
**CODE:-**
```c
#include
int main(){
int a,b,c,x,eval;
printf("Enter the value of a, b, c, x:-");
scanf("%d%d%d%d",&a,&b,&c,&x);
eval=a*x*x+b*x+c;
printf("Result is:- %d \n",eval);
return 0;
}
```
**Output:-**
**Enter the value of a, b, c, x: - 10 5 7 2**
**Result is:- 57.**
---
### **PRACTICAL-2**
**Objective: Write a C program to find the sum of first n even natural numbers**
**CODE:-**
```c
#include
int main(){
int n,sum;
printf("Enter the value of n:- ");
scanf("%d",&n);
sum=n*(n+1);
printf("Sum of first %d even natural number is:- %d \n",n,sum );
return 0;
}
```
**Output:-**
**Enter the value of n:- 20**
**Sum of first 20 even natural number is:- 420**
---
### **PRACTICAL-3**
**Objective: Write a C program to find weather the given year is leap year or not.**
**CODE:-**
```c
#include
int main(){
int year;
printf("Enter the year:- ");
scanf("%d",&year);
if(year%4==0 || year%400==0){
printf("%d is the leap year\n",year);
}
else if(year%100==0){
printf("%d is not the leap year\n",year);
}
else{
printf("%d is not the leap year\n",year);
}
return 0;
}
```
**Output:-**
**Enter the year:- 2026**
**2026 is not the leap year**
---
### **PRACTICAL-4**
**Objective:** **Write a 'C' program to accept input and print whether the given input is a character, digit, or special symbol using a switch-case.**
**CODE:-**
```c
#include
int main()
{
char num;
printf("Enter Any Character :-");
scanf("%c", &num);
switch(num>='a'&& num<='z'||num>='A'&& num<='Z')
{
case 1:
printf("It's alphabet");
break;
case 0:
switch(num>='0' && num<='9')
{
case 1:
printf("It's digit");
break;
case 0:
printf("It's special symbol");
break;
}
break;
}
return 0;
}
```
**Output:-**
**Enter Any Character :- $**
**It's special symbol**
---
### **PRACTICAL-5**
**Objective: Write a C program t accept a number and print the name of the month using switch case**
**CODE:-**
```c
#include
int main(){
int n;
printf("Enter the number of year:- ");
scanf("%d",&n);
switch (n)
{
case 1: printf("January\n");
break;
case 2: printf("February\n");
break;
case 3: printf("March\n");
break;
case 4: printf("April\n");
break;
case 5: printf("May\n");
break;
case 6: printf("June\n");
break;
case 7: printf("July\n");
break;
case 8: printf("August\n");
break;
case 9: printf("September\n");
break;
case 10: printf("October\n");
break;
case 11: printf("November\n");
break;
default: printf("December\n");
break;
}
return 0;
}
```
**Output :-**
**Enter the number of year:- 9**
**September**
---
### **PRACTICAL-6**
**Objective: Write a C program to find maximum and minimum number from an array of integer.**
**CODE:-**
```c
#include
int main(){
int arr[6];
printf("Enter any 6 numbers:- ");
for(int i=0;i<6;i++){
scanf("%d",&arr[i]);
}
int max=arr[0];
int min=arr[0];
for(int i=0;i<6;i++){
if(maxarr[i]){
min=arr[i];
}
}
printf("The largest element of the array is:-%d\n",max);
printf("The smallest element of the array is:-%d\n",min);
return 0;
}
```
**Output :-**
**Enter any 6 numbers:- 22 76 13 9 20 2**
**The largest element of the array is:- 76**
**The smallest element of the array is:2**
---
### **PRACTICAL-7**
**Objective: Write a C program to find the transpose of a matrix**
**CODE:-**
```c
#include
int main(){
int arr[3][3];
printf("Enter the elements in 3X3 matrix:- ");
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
scanf("%d",&arr[i][j]);
}
}
printf("Transpose of matrix is:- \n");
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
printf("%d ",arr[j][i]);
}printf("\n");
}
return 0;
}
```
**Output :-**
**Enter the elements in 3X3 matrix:- 3 6 8**
**2 5 9**
**7 8 9**
**Transpose of matrix is:- 3 2 7**
**6 5 8**
**8 9 9**
---
### **PRACTICAL-8**
**Objective: Write a C program to find the sum of diagonals of a matri**
**CODE:-**
```c
#include
int main(){
int n,sum=0;
printf("Enter the size of square matrix:- ");
scanf("%d",&n);
printf("Enter the values of matrix:- ");
int arr[n][n];
for(int i=0;i