Create Days.c

C program added Days.c  which will calculate total number of days between 2 dates!!!

Days.c

@@ -0,0 +1,168 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<stdbool.h>
+#include<math.h>
+bool leapyear(int y)
+{
+        if(y%100==0)
+        {
+            if(y%400==0)
+            {
+                return 1;
+            }
+            else return 0;
+        }
+        else if(y%4==0)
+        {
+            return 1;
+        }
+        else return 0;
+}
+long calcleapyears(int y)
+{
+    int cnt=0;
+    for(int i=0;i<=y;i++)
+    {
+        if(leapyear(i)==1)
+        {
+            cnt++;
+        }
+        else continue;
+    }
+    return cnt;
+}
+int calcdaysinmonth(int m, int y)
+{
+    int sum=0;
+    for(int i=1;i<m;i++)
+    {
+        if(i==1 || i==3 || i==5 || i==7 || i==8 || i==10 || i==12)
+        {
+            sum+=31;
+        } 
+        else if(i==4 || i==6 || i==9 || i==11)
+        {
+            sum+=30;
+        }
+        else if(i==2)
+        {
+            if(leapyear(y)==1)
+            {
+                sum+=29;
+            }
+            else if(leapyear(y)==0)
+            {
+                sum+=28;
+            }
+        }
+    }
+    return sum;
+}
+bool checkdate(int d,int m,int y)
+{
+    if(m==1 || m==3 || m==5 || m==7 || m==8 || m==10 || m==12)
+    {
+        if(d==0 || d>31)
+        {
+            return 0;
+        }
+        else if(d>0 && d<32)
+        {
+            return 1;
+        }
+    }
+    else if(m==4 || m==6 || m==9 || m==11)
+    {
+        if(d==0 || d>30)
+        {
+            return 0;
+        }
+        else if(d>0 && d<31)
+        {
+            return 1;
+        }
+    }
+    else if(m==2)
+    {
+        if(leapyear(y)==1)
+        {
+            if(d==0 || d>29)
+            {
+                return 0;
+            }
+            else if(d>0 && d<30)
+            {
+                return 1;
+            }
+        }
+        else if(leapyear(y)==0)
+        {
+            if(d==0 || d>28)
+            {
+                return 0;
+            }
+            else if(d>0 && d<29)
+            {
+                return 1;
+            }
+        }
+    }
+}
+int main()
+{
+    int d1,m1,y1,d2,m2,y2;
+    printf("Enter the earlier date d1(dd mm yyyy) : ");
+    scanf("%d %d %d",&d1,&m1,&y1);
+    printf("Enter the later date d2(dd mm yyyy) : ");
+    scanf("%d %d %d",&d2,&m2,&y2);
+    long long sum1=0,sum2=0,sum;
+
+    sum1=( (y1-calcleapyears(y1))*365 ) + (calcleapyears(y1)*366);
+    if(m1==0 || m1>12)
+    {
+        printf("The input month in date d1 is wrong!!!");
+        exit(0);
+    }
+    else if(m1>0 && m1<13)
+    {
+    sum1+=calcdaysinmonth(m1,y1);
+    }
+    if(checkdate(d1,m1,y1)==1)
+    {
+        sum1+=d1;
+    }
+    else if(checkdate(d1,m1,y1)==0)
+    {
+        printf("The input date in d1 is wrong!!!");
+        exit(0);
+    }
+
+    sum2=( (y2-calcleapyears(y2))*365 ) + (calcleapyears(y2)*366);
+    if(m2==0 || m2>12)
+    {
+        printf("The input month in date d2 is wrong!!!");
+        exit(0);
+    }
+    else if(m2>0 && m2<13)
+    {
+    sum2+=calcdaysinmonth(m2,y2);
+    }
+    if(checkdate(d2,m2,y2)==1)
+    {
+        sum2+=d2+1;
+    }
+    else if(checkdate(d2,m2,y2)==0)
+    {
+        printf("The input date in d2 is wrong!!!");
+        exit(0);
+    }
+    if(sum1>sum2)
+    {
+        printf("The dates entered are in wrong order!!!");
+        exit(0);
+    }
+
+    sum=sum2-sum1;
+    printf("The total number of days between two given dates is : %Ld \n",sum);
+    exit(0);
+}