**The Program in C to double all the elements of the Matrix is given below**:

```
#include <stdio.h>
void double_matrix(int *matrix, int rows, int cols) {
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
matrix[i*cols + j] *= 2;
}
}
}
int main() {
int rows, cols, i, j;
printf("Enter the number of rows: ");
scanf("%d", &rows);
printf("Enter the number of columns: ");
scanf("%d", &cols);
int matrix[rows][cols];
printf("Enter the elements of the matrix: \n");
for (i = 0; i < rows; i++) {
for (j = 0; j < cols; j++) {
scanf("%d", &matrix[i][j]);
}
}
double_matrix((int*)matrix, rows, cols);
printf("Matrix after doubling all elements:\n");
for (i = 0; i < rows; i++) {
for (j = 0; j < cols; j++) {
printf("%d ", matrix[i][j]);
}
printf("\n");
}
return 0;
}
```

## Output:

Enter the number of rows: 2

Enter the number of columns: 2

Enter the elements of the matrix:

67

56

89

23

Matrix after doubling all elements:

134 112

178 46

## Pro-Tips**💡**

This program prompts the user to enter the number of rows and columns of the matrix, and then the elements of the matrix.

It then uses the double_matrix function defined earlier to double all elements of the matrix and prints the resulting matrix.

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