First commit

Author: nukala.akhil

DEMO_file

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main(void) 
+{
+
+    char ch = 'A';
+    fprintf(stderr, "%c\n", ch);
+}

DEMO_file.c

@@ -0,0 +1 @@
+Subproject commit 5b7ac15ef81a4ee04455c1881923aa81c0439eff

cs50

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main0(void) 
+{
+
+    char ch = 'A';
+    fprintf(stderr, "%c\n", ch);
+}

finance.db

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include<stdlib.h>
+
+void swap(int *x, int *y);
+
+typedef struct node
+{
+    int n;
+    struct node *ptr;
+}
+node;
+
+int main(void)
+{
+    int *x;
+    int *y;
+    node *root = malloc(sizeof(node));
+    node *trav = root;
+    if (trav -> ptr == NULL)
+    {
+        printf("YOOO NULLL");
+    }
+    x = malloc(sizeof(int));
+    y = malloc(sizeof(int));
+    *x = 5;
+    *y = 6;
+    swap(x, y);
+    printf("%i, %i\n", *x, *y);
+    printf("%lu\n", sizeof(char *));
+    char *filename = malloc(sizeof(char *));
+    //sprintf(filename, "%03i.jpg", 5);
+   // FILE *img = fopen(filename, "w");
+    int *buffer = malloc(sizeof(int));
+    *buffer = 10;
+    fwrite(buffer, 1, 1, img);
+    free(x);
+    free(y);
+    
+}
+
+void swap(int *x, int *y)
+{
+    int temp = *x;
+    *x = *y;
+    *y = temp;
+}

fprinf_DEMO.c

@@ -0,0 +1,112 @@
+#include <stdio.h>
+#include <cs50.h> 
+
+bool validNumDigits(long long num);
+int getSum(long long num);
+
+int main(void)
+{
+    printf("Number: ");
+    long long num = get_long_long();
+    
+    int total = 0;
+    if (validNumDigits(num))
+    {
+        total = getSum(num);
+        if (total % 10 == 0)
+        {
+            while (num > 100)
+            {
+                num = num/10;
+            }
+            if (num == 34 || num == 37)
+            {
+                printf("AMEX\n");
+            }
+            else if (num > 50 && num < 56)
+            {
+                printf("MASTERCARD\n");
+            }
+            else if ( (num/10) == 4)
+            {
+                printf("VISA\n");
+            }
+            else
+            {
+                printf("INVALID\n");
+            }
+        }
+        else
+        {
+            printf("INVALID\n");
+        }
+        
+    }
+    else
+    {
+        printf("INVALID\n");
+    }
+}
+
+bool validNumDigits(long long num)
+{
+    int count = 0;
+    while (num > 0)
+    {
+        count++;
+        num = num/10;
+    }
+    if (count == 15 || count == 16 || count == 13)
+    {
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+int getSum(long long num)
+{
+    int sum = 0;
+    int count = 1;
+    while (num > 0)
+    {
+        if (count % 2 == 0)
+        {
+            int rem = num % 10;
+            switch(rem)
+            {
+                case 1:
+                case 2:
+                case 3:
+                case 4:
+                    sum += (rem * 2);
+                    break;
+                case 5:
+                    sum += 1;
+                    break;
+                case 6:
+                    sum += 3;
+                    break;
+                case 7:
+                    sum += 5;
+                    break;
+                case 8:
+                    sum += 7;
+                    break;
+                case 9:
+                    sum += 9;
+                    break;
+            }
+        }
+        else
+        {
+            int rem = num % 10;
+            sum += rem;
+        }
+        num = num/10;
+        count++;
+    }
+    return sum;
+}

pointers

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int main(void)
+{
+    printf("Hello, world!\n");
+}

pointers.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <cs50.h>
+
+int main(void)
+{
+    printf("Enter a non-negative integer < 24: ");
+    int height = get_int();
+    while (height > 23 || height < 0)
+    {
+        printf("Enter a non-negative integer < 24: ");
+        height = get_int();
+    }
+    for (int i = 0; i < height; i++)
+    {
+        for (int k = height-1; k > i; k--)
+        {
+            printf(" ");
+        }
+        for (int j = 0; j <= i; j++)
+        {
+            printf("#");
+        }
+        printf("  ");
+        for (int j = 0; j <= i; j++)
+        {
+            printf("#");
+        }
+        
+        printf("\n");
+    }
+        
+        
+}

pset1/credit

@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <cs50.h>
+
+int main(void)
+{
+    printf("Minutes: ");
+    int min = get_int();
+    printf("Bottles: %i\n", min * 12);
+}

pset1/credit.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <cs50.h>
+#include <string.h>
+
+int main(int argc, string argv[])
+{
+    if (argc != 2)
+    {
+        printf("wrong no of arguments\n");
+        return 1;
+    }
+    int key = atoi(argv[1]);
+    key = key % 26;
+    printf("plaintext: ");
+    string s = get_string();
+    printf("ciphertext: ");
+    for (int i = 0, n = strlen(s); i < n; i++)
+    {
+        if (isupper(s[i]))
+        {
+            printf("%c", (s[i] - 'A' + key ) % 26 + 'A');
+        }
+        else if (islower(s[i])) 
+        {
+            printf("%c", (s[i] - 'a' + key ) % 26 + 'a');
+        }
+        else
+        {
+            printf("%c", s[i]);
+        }
+    }
+    printf("\n");
+}

pset1/hello

@@ -0,0 +1,26 @@
+#include <stdio.h> 
+#include <cs50.h>
+#include <string.h>
+#include <ctype.h>
+
+int main(void)
+{
+    string s = get_string();
+    bool flag = true;
+    for (int i = 0, n = strlen(s); i < n; i++)
+    {
+        if ( ('a' <= s[i] && s[i] <= 'z' ) || ('A' <= s[i] && s[i] <= 'Z' ) )
+        {
+            if (flag)
+            {
+                printf("%c", toupper(s[i]));
+                flag = false;
+            }
+        }
+        else if (s[i] == ' ' && i > 0)
+        {
+            flag = true;
+        }
+    }
+    printf("\n");
+}

pset1/hello.c

@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <cs50.h>
+#include <string.h>
+
+int main(int argc, string argv[])
+{
+    if (argc != 2)
+    {
+        printf("wrong no of arguments\n");
+        return 1;
+    }
+    for (int i = 0, n = strlen(argv[1]); i < n; i++)
+    {
+        if (!(isalpha(argv[1][i])))
+        {
+            printf("wrong key\n");
+            return 1;
+        }
+    }
+    int index = 0;
+    
+    string key = argv[1];
+    int keylen = strlen(key);
+    printf("plaintext: ");
+    string s = get_string();
+    printf("ciphertext: ");
+    int shift;
+    for (int i = 0, n = strlen(s); i < n; i++)
+    {
+        if (isupper(s[i]))
+        {
+            if (index >= keylen)
+            {
+                index = 0;
+            }
+            
+            if (isupper(key[index]))
+            {
+                shift = key[index] - 'A';
+            }
+            else 
+            {
+                shift = key[index] - 'a';
+            }
+            printf("%c", (s[i] - 'A' + shift ) % 26 + 'A');
+            
+            index++;
+        }
+        else if (islower(s[i])) 
+        {
+            if (index >= keylen)
+            {
+                index = 0;
+            }
+            if (isupper(key[index]))
+            {
+                shift = key[index] - 'A';
+            }
+            else 
+            {
+                shift = key[index] - 'a';
+            }
+            printf("%c", (s[i] - 'a' + shift ) % 26 + 'a');
+            
+            index++;
+        }
+        else
+        {
+            printf("%c", s[i]);
+        }
+    }
+    printf("\n");
+}

pset1/mario

@@ -0,0 +1,5 @@
+fifteen: fifteen.c
+	clang -ggdb3 -O0 -std=c11 -Wall -Werror -o fifteen fifteen.c -lcs50 -lm
+
+clean:
+	rm -f *.o a.out core fifteen log.txt