all of my psets

README.md

@@ -1,2 +1,4 @@
 # cs50
 these are all my cs50 psets
+
+[pset3,pset5,pset8 are not complete and others might not work as they were made from cs502018 course]

pset1/cash.c

@@ -0,0 +1,32 @@
+#include<cs50.h>
+#include<stdio.h>
+
+int main(void)
+{
+    float n;
+    int c;
+    int y;
+    while(1)
+    {
+        n= get_float("change owed :");
+        if(n>0)
+        {
+            break;
+        }
+        else
+        {
+            continue;
+        }
+    }
+    c=n/0.25;
+    n=n-(c*0.25);
+    y=n/0.10;
+    c=c+y;
+    n=n-(y*0.10);
+    y=n/0.05;
+    c=c+y;
+    n=n-(y*0.05);
+    y=n/0.01;
+    c=c+y;
+    printf("the amount of coins : %d",c);
+}

pset1/credit.c

@@ -0,0 +1,40 @@
+#include<stdio.h>
+#include<cs50.h>
+#include<math.h>
+
+int main(void)
+{
+    long int n;
+    int sum=0;
+    int sum1=0;
+    int sum2=0;
+    long int R=0,y=0;
+    while(1)
+    {
+        n= get_long_long("enter your card number :");
+        if(n>0)
+        {
+            break;
+        }
+        else
+        {
+            continue;
+        }
+    }
+    for(int i=1;i<=13;i+=2)
+    {
+        R=n/pow(10,i);
+        sum1+=(2*(R%10));
+    }
+    for(int J=0;J<=15;J+=2)
+    {
+        y=n/pow(10,J);
+        sum2+=(y%10);
+    }
+    sum=sum1+sum2;
+    if (sum%10==0)
+    {
+        printf("VISA\n");
+    }
+    else printf("INVALID\n");
+}

pset1/hello/hello.c

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

pset1/mario/more/mario.c

@@ -0,0 +1,28 @@
+#include<stdio.h>
+int main(void)
+{
+    int n;
+    scanf("how long do you want the pyramid : %d",&n);
+    int x=n;
+    int y;
+    for(int i=0;i<n;i++)
+    {
+        for(int k=0;k<x;k++)
+        {
+            printf("  ");
+        }
+        y=n-x;
+        x--;
+        for(int j=0;j<y;j++)
+        {
+            printf("__");
+        }
+        printf("  ");
+        for(int l=0;l<y;l++)
+        {
+            printf("__");
+        }
+        printf("\n");
+    }
+    return 0;
+}

pset2/caesar.c

@@ -0,0 +1,37 @@
+#include<stdio.h>
+#include<cs50.h>
+#include<string.h>
+void cipher(int a);
+int main(int k,char *a[])
+{
+    if (k>2&&k<2)
+    {
+        printf("error , enter a correct value pf key.");
+        return 1;
+    }
+    else
+    {
+        int i= atoi(a[1]);
+        if (i<=26&&i>=1)
+        {
+            cipher(i);
+        }
+        else
+        {
+            int n=0;
+            n=i/26;
+            i=i-(n*26);
+            cipher(i);
+        }
+    }
+}
+void cipher(a)
+{
+    string s=get_string("enter a sentence to cipher :");
+    int n=strlen(s);
+    for(int j=0;j<n;j++)
+    {
+        s[j]+=a;
+    }
+    printf("cipher text :%s",s);
+}

pset2/crack/crack.c

@@ -0,0 +1,76 @@
+#include<stdio.h>
+#include<cs50.h>
+#include<string.h>
+#define _XOPEN_SOURCE
+#include <unistd.h>
+void decipher(string hp,string s);
+string crypt(string key,string salt);
+int main(int k,string a[])
+{
+    string t= a[1];
+    char salt[2];
+    if (k>2&&k<2)
+    {
+        printf("error , enter a correct value of key.");
+        return 1;
+    }
+    else
+    {
+        salt[0]=t[0];
+        salt[1]=t[1];
+        decipher(t,salt);
+    }
+}
+void decipher(string hp,string s)
+{
+    char pass[5];
+    string hashed;
+    string alphabet="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    //for five characters
+    for(int i=0;i<52;i++)
+    {
+        pass[0]=alphabet[i];
+        hashed=crypt(pass,s);
+        if(strcmp(hashed,hp)==0)
+        {
+            goto print;
+        }
+        for(int j=0;j<52;j++)
+        {
+            pass[1]=alphabet[i];
+            hashed=crypt(pass,s);
+            if(strcmp(hashed,hp)==0)
+            {
+                goto print;
+            }
+            for(int k=0;k<52;k++)
+            {
+                pass[2]=alphabet[i];
+                hashed=crypt(pass,s);
+                if(strcmp(hashed,hp)==0)
+                {
+                    goto print;
+                }
+                for(int l=0;l<52;l++)
+                {
+                    pass[3]=alphabet[i];
+                    hashed=crypt(pass,s);
+                    if(strcmp(hashed,hp)==0)
+                    {
+                        goto print;
+                    }
+                    for(int m=0;m<52;m++)
+                    {
+                        pass[4]=alphabet[i];
+                        hashed=crypt(pass,s);
+                        if(strcmp(hashed,hp)==0)
+                        {
+                            goto print;
+                        }
+                    }
+                }
+            }
+        }
+    }
+    print: printf("deciphered text : %s",pass);
+}

pset2/vigenere/vigenere.c

@@ -0,0 +1,67 @@
+#include<stdio.h>
+#include<cs50.h>
+#include<string.h>
+#include<ctype.h>
+void cipher(int h[],int o);
+int main(int k,string a[])
+{
+    string t=a[1];
+    int n=strlen(t);
+    int f[n];
+    if (k>2&&k<2&&(isalpha(a[1])==0))
+    {
+        printf("error , enter a correct value key.");
+        return 1;
+    }
+    else
+    {
+        for(int j=0;j<n;j++)
+        {
+            f[j]=t[j];
+            if(f[j]>=97)
+            {
+                f[j]-=97;
+            }
+            else if(f[j]>=65)
+            {
+                f[j]-=65;
+            }
+        }
+        cipher(f,n);
+    }
+    return 0;
+}
+void cipher(int h[],int o)
+{
+    string s=get_string("plaintext :");
+    int m=strlen(s);
+    int b=0;
+    for (int j=0;j<m;j++)
+    {
+        if(isalpha(s[j]))
+        {
+            if(b>=o)
+            {
+                b=0;
+            }
+            s[j]+=h[b];
+            if(!isalpha(s[j]))
+            {
+                if(s[j]>=123)
+            {
+                s[j]-=97;
+                s[j]%=26;
+                s[j]+=97;
+            }
+            else if(s[j]>=92)
+            {
+                s[j]-=65;
+                s[j]%=26;
+                s[j]+=65;
+            }
+            }
+            b++;
+        }
+    }
+    printf("ciphertext :%s",s);
+}

pset3/music/Makefile

@@ -0,0 +1,16 @@
+CC ?= clang
+CFLAGS ?= -fsanitize=integer -fsanitize=undefined -ggdb3 -O0 -std=c11 -Wall -Werror -Wextra -Wno-sign-compare -Wshadow
+LDLIBS ?= -lcs50 -lm
+
+.PHONY: all
+all: notes synthesize
+
+notes: helpers.c helpers.h notes.c wav.c wav.h
+	$(CC) $(CFLAGS) -o notes helpers.c notes.c wav.c $(LDLIBS)
+
+synthesize: synthesize.c wav.c wav.h helpers.c helpers.h
+	$(CC) $(CFLAGS) -o synthesize helpers.c synthesize.c wav.c $(LDLIBS)
+
+.PHONY: clean
+clean:
+	rm -f notes synthesize *.wav

pset3/music/bday.txt

@@ -0,0 +1,25 @@
+D4@1/8
+D4@1/8
+E4@1/4
+D4@1/4
+G4@1/4
+F#4@1/2
+D4@1/8
+D4@1/8
+E4@1/4
+D4@1/4
+A4@1/4
+G4@1/2
+D4@1/8
+D4@1/8
+D4@1/4
+B4@1/4
+G4@1/4
+F#4@1/4
+E4@1/4
+C4@1/8
+C4@1/8
+B4@1/4
+G4@1/4
+A4@1/4
+G4@1/2