diff --git a/C/program-74/program.c b/C/program-74/program.c
new file mode 100644
index 00000000..0c61fc16
--- /dev/null
+++ b/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;  
+}   
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diff --git a/C/program-74/readme.md b/C/program-74/readme.md
new file mode 100644
index 00000000..abdd17c1
--- /dev/null
+++ b/C/program-74/readme.md
@@ -0,0 +1 @@
+C Program to reverse a given number
\ No newline at end of file
diff --git a/C/program-79/program.c b/C/program-79/program.c
new file mode 100644
index 00000000..1a3a9094
--- /dev/null
+++ b/C/program-79/program.c
@@ -0,0 +1,22 @@
+#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;
+}
\ No newline at end of file
diff --git a/C/program-79/readme.md b/C/program-79/readme.md
new file mode 100644
index 00000000..ec5e5b99
--- /dev/null
+++ b/C/program-79/readme.md
@@ -0,0 +1 @@
+C Program to calculate Simple Interest
\ No newline at end of file