void main()
{
int a=1, b=3, c=4, n=10, sum, i;
printf("%d %d ",a,b,c);
for(i=4; i<=n; i++)
{
sum = a+b+c;
printf("%d ",sum);
a = b;
b = c;
c = sum;
}
}
int main()
{
int a=2,i,n=10;
for(i=1;i<=n;i++)
{
printf("%d ",a);
a+=13*i;
}
return 0;
}
int main()
{
int a=1,b=2,i,n=10;
printf("%d %d ",a, b);
for(i=3;i<=n;i++)
{
if(i%2==1)
{
a=a*3;
printf("%d ",a);
}
else
{
b=b*3;
printf("%d ",b);
}
}
return 0;
}
int main()
{
double i, n,sum=0;
n=10;
for(i=1;i<=n;i++)
{
if ((int)i%2==1)
sum+=i/(i+1);
else
sum-=i/(i+1);
}
printf("Sum: %lf",sum);
return 0;
}
double power(int a, int b)
{
long i, p=1;
for(i=1;i<=b;i++)
{
p=p*a;
}
return p;
}
double fact(int n)
{
long i, f=1;
for(i=1;i<=n;i++)
{
f=f*i;
}
return f;
}
int main()
{
long i,n;
double sum=0;
n=5;
for(i=1;i<=n;i++)
{
sum=sum+power(i,i)/fact(i);
}
printf("Sum: %lf",sum);
return 0;
}long power(int a, int b)
{
long i, p=1;
for(i=1;i<=b;i++)
{
p=p*a;
}
return p;
}
int main()
{
long i,n;
double sum=0;
n=5;
for(i=1;i<=n;i++)
{
sum=sum+(power(i,i)/i);
}
printf("Sum: %lf",sum);
return 0;
}
long fact(int n)
{
long i, f=1;
for(i=1;i<=n;i++)
{
f=f*i;
}
return f;
}
int main()
{
long i,n;
double sum=0;
n=5;
for(i=1;i<=n;i++)
{
sum=sum+(fact(i)/i);
}
printf("Sum: %lf",sum);
return 0;
}
long power(int a, int b)
{
long i, p=1;
for(i=1;i<=b;i++)
{
p=p*a;
}
return p;
}
int main()
{
long i,n,sum=0;
n=5;
for(i=1;i<=n;i++)
{
sum=sum+power(i,i);
}
printf("Sum: %d",sum);
return 0;
}
long fact(int n)
{
long i, f=1;
for(i=1;i<=n;i++)
{
f=f*i;
}
return f;
}
int main()
{
long i,n,sum=0;
n=5;
for(i=1;i<=n;i++)
{
sum=sum+fact(i);
}
printf("Sum: %d",sum);
return 0;
}
int main()
{
int i,j,n,sum=0;
n=10;
for(i=1;i<=n;i++)
{
for(j=1;j<=i;j++)
{
sum+=j;
}
}
printf("Sum: %d",sum);
return 0;
}int main()
{
int i,n,sum=0;
n=10;
for(i=1;i<=n;i++)
{
sum+=i*i;
}
printf("Sum: %d",sum);
return 0;
}int main()
{
int i,n,sum=0;
n=10;
for(i=1;i<=n;i++)
{
sum+=i;
}
printf("Sum: %d",sum);
return 0;
}
A AB ABC ABCD ABCDE | E DE CDE BCDE ABCDE |
| Code of above pattern | Code of above pattern |
A BA CBA DCBA EDCBA | E ED EDC EDCB EDCBA |
| Code of above pattern | Code of above pattern |
ABCDE ABCD ABC AB A | ABCDE BCDE CDE DE E |
| Code of above pattern | Code of above pattern |
EDCBA DCBA CBA BA A | EDCBA EDCB EDC ED E |
| Code of above pattern | Code of above pattern |
A BB CCC DDDD EEEEE | E DD CCC BBBB AAAAA |
| Code of above pattern | Code of above pattern |
EEEEE DDDD CCC BB A | AAAAA BBBB CCC DD E |
| Code of above pattern | Code of above pattern |
/* File Copy using command line arguments */
#include<stdio.h>
int main(int argc,char *argv[])
{
FILE *fs,*ft;
int ch;
if(argc!=3)
{
printf("Invalide numbers of arguments.");
return 1;
}
fs=fopen(argv[1],"r");
if(fs==NULL)
{
printf("Can't find the source file.");
return 1;
}
ft=fopen(argv[2],"w");
if(ft==NULL)
{
printf("Can't open target file.");
fclose(fs);
return 1;
}
while(1)
{
ch=fgetc(fs);
if (feof(fs)) break;
fputc(ch,ft);
}
fclose(fs);
fclose(ft);
return 0;
}
/* File to upper case using command line arguments */
#include<stdio.h>
int main(int n,char *a[])
{
int c;
FILE *fr,*fw;
if(n!=3)
{
printf("Invalide numbers of arguments.");
return 1;
}
if((fr=fopen(a[1],"r"))==NULL)
{
printf("File can't be open.");
return 1;
}
if((fw=fopen(a[2],"r+"))==NULL)
{
printf("File can't be open.");
fclose(fr);
return 1;
}
while(1)
{
c=fgetc(fr);
if(feof(fr)) break;
c=~c;
fputc(c,fw);
}
fclose(fr);
fclose(fw);
return 0;
}
/* Count characters of file */
#include<stdio.h>
int main()
{
FILE *fp;
char a[10];
long cnt=0;
int c;
printf("Type a file name : ");
gets(a);
if((fp=fopen(a,"r"))==NULL)
printf("File dosen't exist.");
else
{
while(1)
{
c=fgetc(fp);
if(feof(fp)) break;
cnt++;
}
printf("\nfile have %ld characters",cnt);
}
fclose(fp);
return 0;
}
/* Write to text file */
#include<stdio.h>
int main()
{
FILE *fp;
char mystr[100];
fp=fopen("mytext.txt","w");
if(fp==NULL)
{
puts("Some error occured.");
return 1;
}
printf("\nEnter some lines:\n");
while(strlen(gets(mystr))>0)
{
fputs(mystr,fp);
fputs("\n",fp);
}
fclose(fp);
return 0;
}
/* Read text file */
#include<stdio.h>
int main()
{
FILE *fp;
int ch;
fp=fopen("myfile.txt","r");
if(fp==NULL)
{
printf("Can't find the source file.");
return 1;
}
while(1)
{
ch=fgetc(fp);
if(feof(fp)) break;
printf("%c",ch);
}
fclose(fp);
return 0;
}
/* Towers of Hanoi by recursion */
#include<stdio.h>
void toh(int,char,char,char);
int main()
{
int n=3;
toh(n,'A','B','C');
return 0;
}
void toh(int n,char a,char b,char c)
{
if(n==1)
printf("\nMoved from %c to %c",a,c);
else
{
toh(n-1,a,c,b);
toh(1,a,' ',c);
toh(n-1,b,a,c);
}
}
/* Binary by recursion */
#include<stdio.h>
void binary(long);
int main()
{
long n;
printf("Type a value : ");
scanf("%ld",&n);
binary(n);
return 0;
}
void binary(long n)
{
if(n>1)
binary(n/2);
printf("%ld",n%2);
}
/* GCD by recursion */
#include<stdio.h>
int gcd(int,int);
int main()
{
int a,b;
printf("Type 2 values to find GCD :\n");
scanf("%d %d",&a,&b);
printf("GCD : %d",gcd(a,b));
return 0;
}
int gcd(int m,int n)
{
if(n>m) return gcd(n,m);
if(n==0) return m;
return gcd(n,m%n);
}
/* Sum of digit by recursion */
#include<stdio.h>
int sod(int);
int main()
{
int i;
printf(" Type any value : ");
scanf("%d",&i);
printf("Sum of digit : %d",sod(i));
return 0;
}
int sod(int n)
{
if(n<1)
return 0;
return(n%10+sod(n/10));
}
/* Reverse by Recursion */
#include<stdio.h>
int rev(int,int);
int main()
{
int a;
printf("Type a value : ");
scanf("%d",&a);
printf("Reverse: %d",rev(a,0));
return 0;
}
int rev(int i,int r)
{
if(i > 0)
return rev(i/10,(r*10)+(i%10));
return r;
}
/* Fibonacci by Recursion */
#include<stdio.h>
int fib(int);
int main()
{
printf("Type any value : ");
printf("\nNth value: %d",fib(getche()-'0'));
return 0;
}
int fib(int n)
{
if(n<=1)
return n;
return(fib(n-1)+fib(n-2));
}
/* Power by Recursion */
#include<stdio.h>
int pow(int,int);
int main()
{
int i,j;
printf("Type two values : \n");
scanf("%d %d",&i,&j);
printf("i pow j = %d",pow(i,j));
return 0;
}
int pow(int i,int j)
{
if(j==1)
return i;
return (i*pow(i,j-1));
}
/* Factorial by Recursion */
#include<stdio.h>
int fact(int);
int main()
{
int n;
printf("Type any value : ");
scanf("%d",&n);
n=fact(n);
printf("\nFactorial : %d ",n);
return 0;
}
int fact(int x)
{
if(x==1)
return(x);
else
x=x*fact(x-1);
}
/* Sort array of 10 strings. */
#include<string.h>
#include<stdio.h>
int main()
{
int i,j;
char str[10][10],temp[10];
printf("Type 10 names :\n");
for(i=0;i<10;i++)
{
// gets(str[i]);
// fgets is a better option over gets to read multiword string .
fgets(str[i], 10, stdin);
}
for(i=0;i<10;i++)
{
for(j=0;j<10-1-i;j++)
{
if(strcmpi(str[j],str[j+1])>0)
{
strcpy(temp,str[j]);
strcpy(str[j],str[j+1]);
strcpy(str[j+1],temp);
}
}
}
printf("\nSorted Names :\n");
for(i=0;i<10;i++)
puts(str[i]);
return 0;
}
/* Locate a word in String - STRSTR */
#include<stdio.h>
int main()
{
char str1[100], str2[100];
int i,j,k;
printf("Please enter first string: ");
// gets(str1);
// fgets is a better option over gets to read multiword string .
fgets(str1, 100, stdin);
// Following can be added for extra precaution for '\n' character
// if(str1[length(str1)-1] == '\n') str1[strlen(str1)-1]=NULL;
printf("Please enter a word: ");
// gets(str2);
fgets(str2, 100, stdin);
// if(str2[length(str2)-1] == '\n') str2[strlen(str2)-1]=NULL;
for(i=0;str1[i]!=NULL;i++)
{
for(k=i,j=0;str2[j]!=NULL;j++,k++)
if(str1[k]!=str2[j])
break;
if(str2[j]==NULL)
{
printf("\"%s\" is the sub string of \"%s\" at %d location",str2,str1,k+1);
i=-1;
break;
}
}
if(i!=-1)
printf("\"%s\" is not the sub string of \"%s\"",str2,str1);
return 0;
}
/* Locate a character in String - STRCHR */
#include<stdio.h>
int main()
{
char str[500];
int i;
char ch;
printf("Please enter your string: ");
// gets(str);
// fgets is a better option over gets to read multiword string .
fgets(str, 500, stdin);
// Following can be added for extra precaution for '\n' character
// if(str[length(str)-1] == '\n') str[strlen(str)-1]=NULL;
printf("Please enter a character: ");
getchar(ch);
for(i=0;str[i]!=NULL;i++)
{
if(str[i]==ch)
break;
}
if(str[i] == NULL)
printf("%c not found in %s",ch,str);
else
printf("\"%c\" found in \"%s\" at %d location",ch,str,i+1);
return 0;
}
/* STRING CONCATENATION - STRCAT */
#include<stdio.h>
int main()
{
char str1[500], str2[100];
int i, j;
printf("Please enter first string: ");
// gets(str);
// fgets is a better option over gets to read multiword string .
fgets(str1, 500, stdin);
// Following can be added for extra precaution for '\n' character
// if(str1[length(str1)-1] == '\n') str1[strlen(str1)-1]=NULL;
printf("Please enter second string: ");
// gets(str2);
fgets(str2, 100, stdin);
// if(str2[length(str2)-1] == '\n') str2[strlen(str2)-1]=NULL;
for(i=0;str1[i]!=NULL;i++);
for(j=0;str2[j]!=NULL;j++)
{
str1[i++]=str2[j];
}
str1[i]=NULL;
printf("Concatenated string is: %s",str1);
return 0;
}
/* STRING REVERSE - STRREV */
#include<stdio.h>
int main()
{
char str[100];
int i,j;
char c;
printf("Please enter a string: ");
// gets(str);
// fgets is a better option over gets to read multiword string .
fgets(str, 100, stdin);
// Following can be added for extra precaution for '\n' character
// if(str[length(str)-1] == '\n') str[strlen(str)-1]=NULL;
for(i=0;str[i];i++);
for(j=0,i--;j<i;j++,i--)
{
c=str[i];
str[i]=str[j];
str[j]=c;
}
printf("Reversed string is: %s",str);
return 0;
}
/* STRING COMPARE IGNORE CASE - STRICMP */
#include<stdio.h>
int main()
{
char str1[100], str2[100];
int i, d=0, flag=0;
char x,y;
printf("Please enter first string: ");
// gets(str1);
// fgets is a better option over gets to read multiword string .
fgets(str1, 100, stdin);
// Following can be added for extra precaution for '\n' character
// if(str1[length(str1)-1] == '\n') str1[strlen(str1)-1]=NULL;
printf("Please enter second string: ");
// gets(str2);
fgets(str2, 100, stdin);
// if(str2[length(str2)-1] == '\n') str2[strlen(str2)-1]=NULL;
for(i=0;str1[i]!=NULL&&str2[i]!=NULL;i++)
{
x=str1[i];
y=str2[i];
if(x>='a'&&x<='z')
x-=32;
if(y>='a'&&y<='z')
y-=32;
if(x!=y)
{
break;
flag=1;
}
}
if(flag=0)
{
x=str1[i];
y=str2[i];
if(x>='a'&&x<='z')
x-=32;
if(y>='a'&&y<='z')
y-=32;
}
d=x-y;
if(d==0)
printf("Strings are equal");
else
printf("Strings are not equal");
return 0;
}
/* STRING COMPARE - STRCMP */
#include<stdio.h>
int main()
{
char str1[100], str2[100];
int i,d=0;
printf("Please enter first string: ");
// gets(str1);
// fgets is a better option over gets to read multiword string .
fgets(str1, 100, stdin);
// Following can be added for extra precaution for '\n' character
// if(str1[length(str1)-1] == '\n') str1[strlen(str1)-1]=NULL;
printf("Please enter second string: ");
// gets(str2);
fgets(str2, 100, stdin);
// if(str2[length(str2)-1] == '\n') str2[strlen(str2)-1]=NULL;
for(i=0;str1[i]!=NULL&&str2[i]!=NULL;i++)
{
if(str1[i]!=str2[i])
break;
}
d=str1[i]-str2[i];
if(d==0)
printf("Strings are equal");
else
printf("Strings are not equal");
return 0;
}