Merge pull request #33 from ashish4321/master

Thanks for contributing

convert.c

@@ -0,0 +1,62 @@
+//convert infix to postfix
+#include <stdio.h>
+char stack[20]; //declaring an empty stack
+int top = -1;   //declaring top of stack
+
+void push(char x) //push function
+{
+    stack[++top] = x; //each time it is pushed top is increamented
+}
+
+ char pop()  //pop function
+{
+    if(top == -1)
+        return -1;
+    else
+        return stack[top--]; //each time it is popped top is decreamented
+}
+
+ int priority(char x) // to check the priority of characters
+{
+    if(x == '(')
+        return 0;
+    if(x == '+' || x == '-')
+        return 1;
+    if(x == '*' || x == '/')
+        return 2;
+        if(x=='^')
+        return 3;
+}
+ 
+int main()
+{
+    char exp[20];
+    char *e, x;
+    printf("Enter the expression :: ");
+    scanf("%s",exp);
+    e = exp;
+    while(*e != '\0')
+    {
+        if(isalnum(*e))
+            printf("%c",*e);
+        else if(*e == '(') //push it directly into the stack
+            push(*e);
+        else if(*e == ')') //pop until we gwt the left parenthesis
+        {
+            while((x = pop()) != '(')
+                printf("%c", x);
+        }
+        else
+        {
+            while(priority(stack[top]) >= priority(*e)) //pop until priority of top of stack is greater than equal to priority of expressions character
+                printf("%c",pop());
+            push(*e); //otherwise push
+        }
+        e++;
+    }
+    // keep popping until top is not -1
+    while(top != -1)
+    {
+        printf("%c",pop()); 
+    }
+}

disarium.c

@@ -0,0 +1,31 @@
+// a disarium number is a number such that sum of the digits of the number raised to their respective position equals the number
+#include <stdio.h>
+#include <math.h>
+
+int main() 
+{
+ int n,i=0,j,sum=0,l,k;
+ scanf("%d",&n);
+ k=n; //number stored in temporary variable
+ j=k;
+ while(n>0)
+ {
+  d=n%10;
+  n=n/10;
+  i++; //to get the number of digits which will be the position for last digit
+ }
+   while(k>0)
+   {  
+    l=k%10; //to get the digit
+    sum=sum+pow(l,i);
+    k=k/10;
+    i--;
+   }
+  if(j==sum)
+  {
+   printf("It is an  disarium number");
+  }
+  else
+  printf("It is not disarium number");
+ return 0;
+}