How to convert lowercase to uppercase in c programming? Its very easy. There are different ways to convert string from lower case to upper case and vice versa. We will discuss following ways to convert lowercase to uppercase in c. Using Loop- for, while and do while loops Using Predefined function toupper() Creating own function … Read more
In C programming often a situation may come where we want to pass the information into a program during the execution of the program. These values are called Command Line Arguments(CLA). The “main()” function handles the command line argument. Syntax: int main( int argc, char *argv[] ) { } Here, argc refers to the number of arguments … Read more
A Matrix is Two dimensional array that have number of rows and columns. Addition of Two Matrix in C Programming is very easy. To write program for adding two matrix is same as we perform matrix addition in mathematics. To Add Two Numbers rows and columns of both matrix should be same. Element of each … Read more
In a Linux or UNIX, to check whether GCC is installed on your system enter the following command in the command line −
1 | $ gcc -v |
If GCC compiler installed on your system, then it should print a message as follows −
1 2 3 4 5 | Using built-in specs. Target: i386-redhat-linux Configured with: ../configure --prefix=/usr ....... Thread model: posix gcc version 4.1.2 20080704 (Red Hat 4.1.2-46) |
If GCC is not installed, then you will have to install it yourself On … Read more
Reading a File To read a file there are following function available: Function fgetc(): Function fgetc() is used to read a single character at a time from the input file. The syntax of this function is − Syntax : int fgetc( FILE * fp ); Functions fgets(): Functions fgets() is used to reads string from input … Read more
In the C language decision making statement is executes if the given condition is true otherwise conditional block will never execute. In C language non-zero and non-null values are consider as true, and zero or null values are consider false. if statement Syntax of an if statement −
1 2 3 4 | if(expression) { statements; } |
In a if statement if the expression result is non zero true, then … Read more
Example: Write a program to assign the address of array elements to pointer variable and print the array element with address.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #include <stdio.h> int main () { int arr[] = {10, 20, 30}; int i, *ptr[3]; for ( i = 0; i < 3; i++) { ptr[i] = &arr[i]; // assign the address array element to pointer variable } for ( i = 0; i < 3; i++) { printf("\n Value of arr[%d] = %d", i, *ptr[i] ); printf("\n Address of arr[%d] = %d", i, ptr[i] ); } return 0; } |
OUTPUT
1 2 3 4 5 6 | Value of arr[0] = 10 Address of arr[0] = 1392582964 Value of arr[1] = 20 Address of arr[1] = 1392582968 Value of arr[2] = 30 Address of arr[2] = 1392582972 |
In a C programming language a function is a group of statements that together perform a special task. In every C program has at least one function, which is main(). In a C library has a numerous predefined or built-in functions. For example, strcat() to concatenate two strings, main() from where program execution starts. In a C programming … Read more
Example: Write a program to multiply two matrix. Firstly, ask from user order of matrix( number of rows and column) Then take the elements of matrix from user as a input and print the resultant matrix.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | #include <stdio.h> int main() { int m, n, p, q, i, j, k, sum = 0; int f[10][10], s[10][10], multiply[10][10]; printf("Enter number of rows and columns of first matrix\n"); 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", &f[i][j]); } } printf("Enter number of rows and columns of second matrix\n"); scanf("%d%d", &p, &q); if (n != p) { printf("The matrices can't be multiplied with each other.\n"); } else { printf("Enter elements of second matrix\n"); for (i = 0; i < p; i++) { for (j = 0; j < q; j++) { scanf("%d", &s[i][j]); } } for (i = 0; i < m; i++) { for (j = 0; j < q; j++) { for (k = 0; k < p; k++) { sum = sum + f[i][k]*s[k][j]; } multiply[i][j] = sum; sum = 0; } } printf("Product of the matrices:\n"); for (i = 0; i < m; i++) { for (j = 0; j < q; j++) { printf("%d\t", multiply[i][j]); } printf("\n"); } } return 0; } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | Enter number of rows and columns of first matrix 2 2 Enter elements of first matrix 2 3 4 5 Enter number of rows and columns of second matrix 2 2 Enter elements of second matrix 2 3 4 5 Product of the matrices: 16 21 28 37 |
A pointer that is assigned NULL is called a null pointer. We must initialize NULL pointer during variable declaration. A null pointer refers to pointer variable that does not point to a valid address. Generally NULL pointer is used when you do not have an exact address to be assigned.
1 2 3 4 5 6 7 8 9 10 | #include <stdio.h> int main () { int *ptr = NULL; printf("The value of ptr is : %d", ptr ); return 0; } |
OUTPUT
1 | The value of ptr is : 0 |
