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#include<stdio.h>
int main()
{
    char a='A',c;
    int i,j,n;
    printf("Enter number of rows to print : ");
    scanf("%d",&n);
    for(i=n-1;i>=0;i--)
    {
        c=a+n-1;
        for(j=0;j<i+1;j++)
        {
            printf("%c",c);
            c=c-1;
        }
        printf("\n");
    }
    return 0;
}

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#include <stdio.h>
#include <math.h>
int arm(int a)
{
    int i=0,res=0,dup,rem;
    dup=a;
    while(dup!=0)
    {
       dup= dup/10;
        ++i;  // To find how many digits present
    }
    dup=a;
    while(dup!=0)
    {
        rem=dup%10;
        res+=pow(rem,i);
        dup=dup/10;
    }
    return res;
}
int main()
{
    int n,c;
    scanf("%d",&n);
    c=arm(n);
    if(c==n)
    {
        printf("armstrong number");
    }
    else
    {
        printf("not a armstrong number");
    }
    

    return 0;
}

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#include<stdio.h>
int fib(int k)
{
    if(k==0)
    {
        return 0;
    }
    if(k==1)
    {
        return 1;
    }
    else
    {
        return (fib(k-1)+fib(k-2)); //recursion
    }
    
}
int main()
{
    int a=1,i,j,n;
    printf("Enter number of rows to print: ");
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        for(j=0;j<i+1;j++)
        {
            printf("%d\t",fib(a));
            a++;
        }
        printf("\n");
    }
    return 0;
}

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#include<stdio.h>
#include<string.h>
int main()
{
    char string[20],c;
    int len,n,k;
    printf("Enter the string : ");
    gets(string);
    printf("\nEnter the position to insert character : ");
    scanf("%d",&n);
    k=n;
    printf("\nEnter the character to insert : ");
    scanf("%s",&c);
    len=strlen(string)+1; //total lenghth of the string + 1
    for(int i=len;i>k;i--)
    {
    string[i-1]=string[i-2];
    }
    string[k-1]=c;
    printf("\nNew String : %s",string);
    return 0;
}

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#include <stdio.h>

int main()
{
    char string[20];
    int i=0;
    gets(string);
    for(i=0;i<strlen(string);i++)
    {
        if(string[i]!='\n')
        {
            if(string[i]>='a'&&string[i]<='z')
            {
                string[i]=string[i]-32;
            }
        }
    }
    printf("%s",string);

    return 0;
}