Hacktoberfest 2021

C/program-74/program.c

@@ -0,0 +1,15 @@
+#include<stdio.h>  
+ int main()    
+{    
+int n, reverse=0, rem;    
+printf("Enter a number: ");    
+  scanf("%d", &n);    
+  while(n!=0)    
+  {    
+     rem=n%10;    
+     reverse=reverse*10+rem;    
+     n/=10;    
+  }    
+  printf("Reversed Number: %d",reverse);    
+return 0;  
+}   

C/program-74/readme.md

@@ -0,0 +1 @@
+C Program to reverse a given number

C/program-77/program.c

@@ -0,0 +1,51 @@
+#include <stdio.h>
+
+int main()
+{
+int m, n, p, q, c, d, k, sum = 0;
+int mat1[10][10], mat2[10][10], mat3[10][10];
+
+printf(“Enter number of rows and columns of mat1 matrix\n”);
+scanf(“%d%d”, &m, &n);
+printf(“Enter elements of matrix 1\n”);
+
+for (c = 0; c < m; c++)
+for (d = 0; d < n; d++)
+scanf(“%d”, &mat1[c][d]);
+
+printf(“\nEnter number of rows and columns of mat2 matrix\n”);
+scanf(“%d%d”, &p, &q);
+
+if (n != p)
+printf(“\nThe matrices can’t be multiplied with each other.\n”);
+else
+{
+printf(“\nEnter elements of matrix2\n”);
+
+for (c = 0; c < p; c++)
+for (d = 0; d < q; d++)
+scanf(“%d”, &mat2[c][d]);
+
+for (c = 0; c < m; c++) {
+for (d = 0; d < q; d++) {
+for (k = 0; k < p; k++) {
+sum = sum + mat1[c][k]*mat2[k][d];
+}
+
+mat3[c][d] = sum;
+sum = 0;
+}
+}
+
+printf(“\nProduct of the matrices:\n”);
+
+for (c = 0; c < m; c++) {
+for (d = 0; d < q; d++)
+printf(“%d\t”, mat3[c][d]);
+
+printf(“\n”);
+}
+}
+
+return 0;
+}

C/program-77/readme.md

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+C program to multiply matrices

C/program-78/program.c

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+#include<stdio.h>
+
+int main()
+{
+    printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");
+    int h, b;
+    float area;
+    printf("\n\nEnter the height of the Triangle: ");
+    scanf("%d", &h);
+    printf("\n\nEnter the base of the Triangle: ");
+    scanf("%d", &b);
+
+    /*
+        Formula for the area of the triangle = (height x base)/2
+
+        Also, typecasting denominator from int to float 
+        to get the output in float
+    */
+    area = (h*b)/(float)2;
+    printf("\n\n\nThe area of the triangle is: %f", area);
+
+    printf("\n\n\t\t\tCoding is Fun !\n\n\n");
+    return 0;
+}

C/program-78/readme.md

@@ -0,0 +1 @@
+C Program to find the Area of Triangle using Base and Height

C/program-79/program.c

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+#include<stdio.h>
+
+void main()
+{
+    printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");
+    float principal_amt, rate, simple_interest;
+    int time;
+    printf("Enter the value of principal amount, rate and time\n\n\n");
+    scanf("%f%f%d", &principal_amt, &rate, &time);
+
+    // considering rate is in percentage
+    simple_interest = (principal_amt*rate*time)/100.0;
+
+    // usually used to align text in form of columns in table
+    printf("\n\n\t\t\tAmount = Rs.%7.3f\n ", principal_amt);
+
+    printf("\n\n\t\t\tRate = Rs.%7.3f\n ", rate);
+    printf("\n\n\t\t\tTime= %d years \n", time);
+    printf("\n\n\t\t\tSimple Interest = Rs.%7.3f\n ", simple_interest);
+    printf("\n\n\t\t\tCoding is Fun !\n\n\n");
+    return 0;
+}

C/program-79/readme.md

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+C Program to calculate Simple Interest