initial commit

digitpos.c

+#include<stdio.h>
+int main()
+{
+    int inp,i=1,rem;
+    printf("Enter a number to find digit position :");
+    scanf("%d",&inp);
+    while (inp!=0)
+    {
+        rem = inp%10;
+        printf("No of %d's is %d\n",i,rem);
+        inp/=10;
+        i*=10;
+    }
+}
\ No newline at end of file

missingele1.c

+#include<stdio.h>
+int main()
+{
+    int list1[]={20,12,65,23,7,9};
+    int list2[]={12,65,7,9,20},i,j,k;
+    printf("Comparing the list2 with list1 to find missing elements:\n");
+    for (i = 0; i < sizeof(list1)/sizeof(int); i++)
+    {
+        k=0;
+        for ( j = 0; j < sizeof(list2)/sizeof(int); j++)
+        {
+            if (list1[i]!=list2[j])
+            {
+                k+=1;
+                if (k>=sizeof(list2)/sizeof(int))
+                {
+                    printf("%d is missing in list 2\n",list1[i]);
+                }
+            }
+        }
+    }
+    return 0;
+}

missingele2.c

+#include<stdio.h>
+int main()
+{
+    int list1[]={20,12,65,23,7,9};
+    int list2[]={12,65,7,9,20};
+    int sum1=0,sum2=0,i;
+    for (i = 0; i < sizeof(list1)/sizeof(int); i++)
+    {
+        sum1=sum1+list1[i];
+        sum2=sum2+list2[i];
+    }
+    printf("Missing element of compared list2 with list1 is : %d",sum1-sum2);
+    return 0;
+}
\ No newline at end of file

password.c

+#include<stdio.h>
+#include<ctype.h>
+#include<string.h>
+#include<unistd.h>
+int check_password(); //functions declaration
+int lower();    
+int upper();
+int digit();
+int punct();
+char *password;
+char warning[100]; //global varible declaration
+int rank=0,i;  
+int main(){
+    password = getpass("\nEnter the password :");
+    rank = check_password();
+    if (rank>=5)
+        printf("\nStrongest");
+    else if (rank == 4)
+        printf("\nStrong");
+    else if (rank == 3)
+        printf("\nMedium");
+    else if (rank == 2)
+        printf("\nAverage");
+    else if (rank == 1)
+        printf("\nWeak");
+    else
+        printf("\nWeakest");
+    printf("\n%s",warning);
+    printf("\n%s\n",password);
+}
+int check_password(){
+    int num=0;
+    if (strlen(password)>=8){
+        num+=1;
+        num+=lower();
+        num+=upper();
+        num+=punct();
+        num+=digit();
+    }
+    return num;
+}
+int lower(){
+    int k=0;
+    i=0;
+    while (i<strlen(password))
+    {
+        if (islower(password[i]))
+            k+=1;
+        i++;
+    }
+    if (k>=3)
+        return 1;
+    else{
+        strcat(warning,"Password must have 3 lower case");
+        return 0;  
+    }
+}
+int upper(){
+    for (i = 0; i < strlen(password); i++)
+    {
+        if (isupper(password[i]))
+        {
+            return 1;
+            break;
+        }
+    }
+    strcat(warning,"Password must have one uppercase");
+    return 0;
+}
+int punct(){
+    for (i = 0; i < strlen(password); i++)
+    {
+        if (ispunct(password[i]))
+        {
+            return 1;
+            break;
+        }
+    }
+    strcat(warning,"Password must have one special character");
+    return 0;
+}
+int digit(){
+    int k=0,seq=0;
+    for (i = 0; i < strlen(password); i++)
+    {
+        if (isdigit(password[i]))
+            k+=1;
+    }
+    if (k>=3)
+    {
+        for (i = 0; i < strlen(password); i++)
+        {
+            if (isdigit(password[i-1])&&isdigit(password[i])&&isdigit(password[i+1]))
+            {
+                if ((password[i-1]-password[i]==1||password[i-1]-password[i]==-1)
+                &&(password[i+1]-password[i]==1||password[i+1]-password[i]==-1))
+                    seq=1;
+            }   
+        }
+        if (seq){
+            strcat(warning,"Avoid sequence of number");
+            return 0;
+        }
+        else
+            return 1;
+    }
+    else{
+        strcat(warning,"Password must have three numeric");
+        return 0;
+    }
+}
\ No newline at end of file

rsrn.c

+#include<stdio.h>
+int rev();
+int sqr();
+int main()
+{
+    int i,f_sqr,f_rev,rev_sqr,sqr_rev;
+    for (i = 1; i <=1000; i++)
+    {
+        f_sqr = sqr(i);
+        // printf("\n(%d)**2 = %d\n",i,f_sqr);
+        f_rev = rev(i);
+        // printf("rev(%d) = %d\n",i,f_rev);
+        rev_sqr = sqr(f_rev);
+        // printf("(%d)**2 = %d\n",f_rev,rev_sqr);
+        sqr_rev = rev(rev_sqr);
+        // printf("rev(%d) = %d\n",rev_sqr,sqr_rev);
+        if (f_sqr==sqr_rev)
+        {
+            printf("%d is reverse square reverse number\n",i);
+        }
+    }
+}
+int sqr(int i){
+    i=i*i;
+    return i;
+}
+int rev(int i){
+    int rem,rev=0;
+    while (i!=0)
+    {
+        rem=i%10;
+        rev=rev*10+rem;
+        i/=10;
+    }
+    return rev;  
+}
\ No newline at end of file