Class 11: C Programming Lab Solutions (Array and String Programs)
Array
42. WAP to read salary of n employees and count salary greater than 60,000.
#include <stdio.h>
int main() {
int n, i, count = 0;
float salary[100];
printf("Enter number of employees: ");
scanf("%d", &n);
for(i = 0; i < n; i++) {
printf("Enter salary of employee %d: ", i + 1);
scanf("%f", &salary[i]);
if(salary[i] > 60000)
count++;
}
printf("Number of employees having salary greater than 60000 = %d", count);
return 0;
}
Output:
Enter number of employees: 5
Enter salary of employee 1: 50000
Enter salary of employee 2: 65000
Enter salary of employee 3: 70000
Enter salary of employee 4: 45000
Enter salary of employee 5: 80000
Number of employees having salary greater than 60000 = 3
43. WAP to read age of 20 students and count number of students of age 16.
#include <stdio.h>
int main() {
int age[20], i, count = 0;
for(i = 0; i < 20; i++) {
printf("Enter age of student %d: ", i + 1);
scanf("%d", &age[i]);
if(age[i] == 16)
count++;
}
printf("Number of students of age 16 = %d", count);
return 0;
}
Output:
Enter age of student 1: 16
Enter age of student 2: 15
Enter age of student 3: 16
...
Enter age of student 20: 17
Number of students of age 16 = 2
44. WAP to read 50 numbers and calculate sum and average of it.
#include <stdio.h>
int main() {
int num[50], i, sum = 0;
float average;
for(i = 0; i < 50; i++) {
printf("Enter number %d: ", i + 1);
scanf("%d", &num[i]);
sum = sum + num[i];
}
average = sum / 50.0;
printf("Sum = %d\nAverage = %.2f", sum, average);
return 0;
}
Output:
Enter number 1: 1
Enter number 2: 2
Enter number 3: 3
...
Enter number 50: 50
Sum = 1275
Average = 25.50
45. WAP to read weight of 40 persons and find the heaviest weight.
#include <stdio.h>
int main() {
float weight[40], heaviest;
int i;
for(i = 0; i < 40; i++) {
printf("Enter weight of person %d: ", i + 1);
scanf("%f", &weight[i]);
}
heaviest = weight[0];
for(i = 1; i < 40; i++) {
if(weight[i] > heaviest)
heaviest = weight[i];
}
printf("Heaviest weight = %.2f", heaviest);
return 0;
}
Output:
Enter weight of person 1: 55
Enter weight of person 2: 67
Enter weight of person 3: 72
...
Enter weight of person 40: 60
Heaviest weight = 72.00
46. WAP to sort an array in ascending order.
#include <stdio.h>
int main() {
int a[100], n, i, j, temp;
printf("Enter number of elements: ");
scanf("%d", &n);
for(i = 0; i < n; i++) {
printf("Enter element %d: ", i + 1);
scanf("%d", &a[i]);
}
for(i = 0; i < n - 1; i++) {
for(j = i + 1; j < n; j++) {
if(a[i] > a[j]) {
temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
}
printf("Array in ascending order: ");
for(i = 0; i < n; i++)
printf("%d ", a[i]);
return 0;
}
Output:
Enter number of elements: 5
Enter element 1: 9
Enter element 2: 3
Enter element 3: 7
Enter element 4: 1
Enter element 5: 5
Array in ascending order: 1 3 5 7 9
47. WAP to sort an array in descending order.
#include <stdio.h>
int main() {
int a[100], n, i, j, temp;
printf("Enter number of elements: ");
scanf("%d", &n);
for(i = 0; i < n; i++) {
printf("Enter element %d: ", i + 1);
scanf("%d", &a[i]);
}
for(i = 0; i < n - 1; i++) {
for(j = i + 1; j < n; j++) {
if(a[i] < a[j]) {
temp = a[i];
a[i] = a[j];
a[j] = temp;
}
}
}
printf("Array in descending order: ");
for(i = 0; i < n; i++)
printf("%d ", a[i]);
return 0;
}
Output:
Enter number of elements: 5
Enter element 1: 9
Enter element 2: 3
Enter element 3: 7
Enter element 4: 1
Enter element 5: 5
Array in descending order: 9 7 5 3 1
48. WAP to display a matrix of order 3x3.
#include <stdio.h>
int main() {
int a[3][3], i, j;
printf("Enter 9 elements of matrix:\n");
for(i = 0; i < 3; i++) {
for(j = 0; j < 3; j++) {
scanf("%d", &a[i][j]);
}
}
printf("Matrix is:\n");
for(i = 0; i < 3; i++) {
for(j = 0; j < 3; j++) {
printf("%d ", a[i][j]);
}
printf("\n");
}
return 0;
}
Output:
Enter 9 elements of matrix:
1 2 3
4 5 6
7 8 9
Matrix is:
1 2 3
4 5 6
7 8 9
49. WAP to add two matrices of order mxn.
#include <stdio.h>
int main() {
int a[10][10], b[10][10], c[10][10];
int m, n, i, j;
printf("Enter rows and columns: ");
scanf("%d %d", &m, &n);
printf("Enter elements of first matrix:\n");
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
scanf("%d", &a[i][j]);
}
}
printf("Enter elements of second matrix:\n");
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
scanf("%d", &b[i][j]);
}
}
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
c[i][j] = a[i][j] + b[i][j];
}
}
printf("Sum of matrices:\n");
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
printf("%d ", c[i][j]);
}
printf("\n");
}
return 0;
}
Output:
Enter rows and columns: 2 2
Enter elements of first matrix:
1 2
3 4
Enter elements of second matrix:
5 6
7 8
Sum of matrices:
6 8
10 12
50. WAP to subtract two 3x3 order matrices.
#include <stdio.h>
int main() {
int a[3][3], b[3][3], c[3][3];
int i, j;
printf("Enter elements of first 3x3 matrix:\n");
for(i = 0; i < 3; i++) {
for(j = 0; j < 3; j++) {
scanf("%d", &a[i][j]);
}
}
printf("Enter elements of second 3x3 matrix:\n");
for(i = 0; i < 3; i++) {
for(j = 0; j < 3; j++) {
scanf("%d", &b[i][j]);
}
}
for(i = 0; i < 3; i++) {
for(j = 0; j < 3; j++) {
c[i][j] = a[i][j] - b[i][j];
}
}
printf("Subtraction of matrices:\n");
for(i = 0; i < 3; i++) {
for(j = 0; j < 3; j++) {
printf("%d ", c[i][j]);
}
printf("\n");
}
return 0;
}
Output:
Enter elements of first 3x3 matrix:
9 8 7
6 5 4
3 2 1
Enter elements of second 3x3 matrix:
1 1 1
1 1 1
1 1 1
Subtraction of matrices:
8 7 6
5 4 3
2 1 0
51. WAP to find transpose of a matrix.
#include <stdio.h>
int main() {
int a[10][10], t[10][10];
int m, n, i, j;
printf("Enter rows and columns: ");
scanf("%d %d", &m, &n);
printf("Enter matrix elements:\n");
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
scanf("%d", &a[i][j]);
}
}
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
t[j][i] = a[i][j];
}
}
printf("Transpose of matrix:\n");
for(i = 0; i < n; i++) {
for(j = 0; j < m; j++) {
printf("%d ", t[i][j]);
}
printf("\n");
}
return 0;
}
Output:
Enter rows and columns: 2 3
Enter matrix elements:
1 2 3
4 5 6
Transpose of matrix:
1 4
2 5
3 6
52. WAP to check if 2 matrices are equal or not.
#include <stdio.h>
int main() {
int a[10][10], b[10][10];
int m, n, i, j, flag = 1;
printf("Enter rows and columns: ");
scanf("%d %d", &m, &n);
printf("Enter first matrix:\n");
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
scanf("%d", &a[i][j]);
}
}
printf("Enter second matrix:\n");
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
scanf("%d", &b[i][j]);
}
}
for(i = 0; i < m; i++) {
for(j = 0; j < n; j++) {
if(a[i][j] != b[i][j]) {
flag = 0;
break;
}
}
}
if(flag == 1)
printf("Matrices are equal");
else
printf("Matrices are not equal");
return 0;
}
Output:
Enter rows and columns: 2 2
Enter first matrix:
1 2
3 4
Enter second matrix:
1 2
3 4
Matrices are equal
String
53. WAP to count length of a string.
#include <stdio.h>
int main() {
char str[100];
int i = 0, length = 0;
printf("Enter string: ");
scanf("%s", str);
while(str[i] != '\0') {
length++;
i++;
}
printf("Length = %d", length);
return 0;
}
Output:
Enter string: Nepal
Length = 5
54. WAP to concatenate two strings.
#include <stdio.h>
int main() {
char str1[100], str2[100];
int i = 0, j = 0;
printf("Enter first string: ");
scanf("%s", str1);
printf("Enter second string: ");
scanf("%s", str2);
while(str1[i] != '\0')
i++;
while(str2[j] != '\0') {
str1[i] = str2[j];
i++;
j++;
}
str1[i] = '\0';
printf("Concatenated string = %s", str1);
return 0;
}
Output:
Enter first string: Ram
Enter second string: Koirala
Concatenated string = RamKoirala
55. WAP to reverse a string.
#include <stdio.h>
int main() {
char str[100], rev[100];
int i = 0, j, length = 0;
printf("Enter string: ");
scanf("%s", str);
while(str[i] != '\0') {
length++;
i++;
}
for(i = length - 1, j = 0; i >= 0; i--, j++) {
rev[j] = str[i];
}
rev[j] = '\0';
printf("Reversed string = %s", rev);
return 0;
}
Output:
Enter string: Nepal
Reversed string = lapeN
56. WAP to copy value of one string to another.
#include <stdio.h>
int main() {
char str1[100], str2[100];
int i = 0;
printf("Enter string: ");
scanf("%s", str1);
while(str1[i] != '\0') {
str2[i] = str1[i];
i++;
}
str2[i] = '\0';
printf("Copied string = %s", str2);
return 0;
}
Output:
Enter string: Computer
Copied string = Computer
57. WAP to compare if two strings are equal or not.
#include <stdio.h>
int main() {
char str1[100], str2[100];
int i = 0, flag = 1;
printf("Enter first string: ");
scanf("%s", str1);
printf("Enter second string: ");
scanf("%s", str2);
while(str1[i] != '\0' || str2[i] != '\0') {
if(str1[i] != str2[i]) {
flag = 0;
break;
}
i++;
}
if(flag == 1)
printf("Strings are equal");
else
printf("Strings are not equal");
return 0;
}
Output:
Enter first string: Nepal
Enter second string: Nepal
Strings are equal
58. WAP to check if a string is palindrome or not.
#include <stdio.h>
int main() {
char str[100], rev[100];
int i = 0, j, length = 0, flag = 1;
printf("Enter string: ");
scanf("%s", str);
while(str[i] != '\0') {
length++;
i++;
}
for(i = length - 1, j = 0; i >= 0; i--, j++) {
rev[j] = str[i];
}
rev[j] = '\0';
for(i = 0; str[i] != '\0'; i++) {
if(str[i] != rev[i]) {
flag = 0;
break;
}
}
if(flag == 1)
printf("Palindrome");
else
printf("Not Palindrome");
return 0;
}
Output:
Enter string: madam
Palindrome
59. WAP to read name of 100 employees and display them.
#include <stdio.h>
int main() {
char name[100][50];
int i, n;
printf("Enter number of employees: ");
scanf("%d", &n);
for(i = 0; i < n; i++) {
printf("Enter name of employee %d: ", i + 1);
scanf("%s", name[i]);
}
printf("Employee names are:\n");
for(i = 0; i < n; i++) {
printf("%s\n", name[i]);
}
return 0;
}
Output:
Enter number of employees: 3
Enter name of employee 1: Ram
Enter name of employee 2: Sita
Enter name of employee 3: Hari
Employee names are:
Ram
Sita
Hari
60. WAP to read string and convert it to uppercase.
#include <stdio.h>
int main() {
char str[100];
int i = 0;
printf("Enter string: ");
scanf("%s", str);
while(str[i] != '\0') {
if(str[i] >= 'a' && str[i] <= 'z') {
str[i] = str[i] - 32;
}
i++;
}
printf("Uppercase string = %s", str);
return 0;
}
Output:
Enter string: nepal
Uppercase string = NEPAL
