matrix multiplication in c using functions and pointers

Write a C program to perform input/output of all basic data types.
Write a C program to enter two numbers and find their sum.
#include 

int main()
{
    int num1, num2, sum;
    
    /*
     * Read two numbers from user
     */
    printf("Enter first number: ");
    scanf("%d", &num1);
    printf("Enter second number:");
    scanf("%d", &num2);
    
    /* Adding both number is simple and fundamental */
    sum = num1 + num2;
    
    /* Prints the sum of two numbers */
    printf("Sum of %d and %d = %d", num1, num2, sum);
    
    return 0;
}


Q. write calculator in c.

#include
#include
int main(void)
{
	float a,b;
	char sign;
	printf("Press 'q' to quit\n");
	printf("Enter any number :");
	scanf("%f",&a);
	do{
		printf("Enter any operator :");
		scanf("%s",&sign);
		printf("Enter any number :");
		scanf("%f",&b);
		switch(sign){
			case'+':
				a=a+b;
				printf("Result :%.2Lf\n",a);
				break;
				case'-':
					a=a-b;
					printf("Result :%.2f\n",a);
					break;
					case'*':
						a=a*b;
						printf("Result :%.2f\n",a);
						break;
						case'/':
						a=a/b;
						printf("Result :%.2f\n",a);
						break;
						case'%':
							a=(b*a)/100;
							printf("Result :%.2f\n",a);
							break;
							default:
								printf("Invalid Operator\n");
						
						}
	}
	while(sign!='q');
	printf("Thank you\n");
	getch();
}


Q How to print Diamond in c.
#include
#include
int main(void)
{
	int i,j,k,r,sp,p,no,n;
	printf("Enter any number :");
	scanf("%d",&no);
	n=no;
	for(r=1; r<=no; r++){
		for(sp=1; sp<=n; sp++){
			printf(" ");
		}
		n--;
		for(p=1; p<=r; p++){
			printf(" %d",r);
		}
		printf("\n");
	}
	for(i=no-1; i>=1; i--){
		for(j=i; j<=no; j++){
			printf(" ");
		}
		for(k=i; k>=1; k--){
			printf(" %d",i);
		}
		printf("\n");
	}
	getch();
}

Write a C program to enter two numbers and perform all arithmetic operations.

Write a C program to enter length and breadth of a rectangle and find its perimeter.
Write a C program to enter length and breadth of a rectangle and find its area.
Write a C program to enter radius of a circle and find its diameter, circumference and area.
Write a C program to enter length in centimeter and convert it into meter and kilometer.
Write a C program to enter temperature in Celsius and convert it into Fahrenheit.
Write a C program to enter temperature in Fahrenheit and convert to Celsius
Write a C program to convert days into years, weeks and days.
Write a C program to find power of any number x ^ y.
Write a C program to enter any number and calculate its square root.
Write a C program to enter two angles of a triangle and find the third angle.
Write a C program to enter base and height of a triangle and find its area.
Write a C program to calculate area of an equilateral triangle.
Write a C program to enter marks of five subjects and calculate total, average and percentage.
Write a C program to enter P, T, R and calculate Simple Interest.
Write a C program to enter P, T, R and calculate Compound Interest.



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