matrices

Lab4/matrices.c

+#include <stdio.h>
+#include <stdlib.h>
+int main (){
+	int x, y, size, byhand, diagonal1 = 1, diagonal2 = 1;
+	
+	printf("input the size of the matrices\n");
+	scanf("%d", &x);
+	y = x;
+	size = x;
+	int matrix1[x][y],
+		matrix2[x][y],
+		resultingMatrix[x][y];
+		
+	printf("type 1 to intput the elements of the matrices by hand. other inputs will generate random elements\n");
+	scanf("%d", &byhand);
+	if (byhand != 1){
+		for(x = 0; x < size; x++){
+			for(y=0; y < size; y++){
+				matrix1[x][y] = rand() % 500;
+				matrix2[x][y] = rand() % 500;
+			}
+		}
+	}else{
+		printf("enter elements of first matrix\n");
+		for(x = 0; x < size; x++){
+			for(y=0; y < size; y++){
+				scanf("%d", &matrix1[x][y]);
+			}
+		}
+		printf("enter elements of the second matrix\n");
+		for(x = 0; x < size; x++){
+			for(y=0; y < size; y++){
+				scanf("%d", &matrix2[x][y]);
+			}
+		}
+	}
+	printf("first matrix:\n");
+	for(x = 0; x < size; x++){
+		for(y=0; y < size; y++){
+			printf("%d, ", matrix1[x][y]);
+		}
+		printf("\n");
+	}
+	printf("second matrix:\n");
+	for(x = 0; x < size; x++){
+		for(y=0; y < size; y++){
+			printf("%d, ", matrix2[x][y]);
+		}
+		printf("\n");
+	}
+		
+	printf("sum of the matrices is as follows:\n");
+	for(x = 0; x < size; x++){
+		for(y=0; y < size; y++){
+			resultingMatrix[x][y]=matrix1[x][y]+matrix2[x][y];
+			printf("%d, ", resultingMatrix[x][y]);
+		}
+		printf("\n");
+	}
+	
+	printf("substraction of the matrices is as follows:\n");
+	for(x = 0; x < size; x++){
+		for(y=0; y < size; y++){
+			resultingMatrix[x][y]=matrix1[x][y]-matrix2[x][y];
+			printf("%d, ", resultingMatrix[x][y]);
+		}
+		printf("\n");
+	}
+	
+	printf("the sum of the multiplication of the diagonals of the first matrix:\n");
+	//using byhand because i dont want to declare another variable. it acts as the sum of the multiplication of the diagonals.
+	for(x = 0; x < size; x++){
+		y = x;
+		diagonal1 = matrix1[x][y] * diagonal1;
+	}
+	for(x=0; x < size; x++){
+		y = size - 1 - x;
+		diagonal2 = matrix1[x][y] * diagonal2;
+	}
+	byhand = diagonal1 + diagonal2;
+	printf("%d\n", byhand);
+	
+	diagonal1=1;
+	diagonal2=1;
+	
+	printf("the sum of the multiplication of the diagonals of the second matrix:\n");
+	for(x = 0; x < size; x++){
+		y = x;
+		diagonal1 = matrix2[x][y] * diagonal1;
+	}
+	for(x=0; x < size; x++){
+		y = size - 1 - x;
+		diagonal2 = matrix2[x][y] * diagonal2;
+	}
+	byhand = diagonal1 + diagonal2;
+	printf("%d\n", byhand);
+		
+	return 0;
+
+}