C Language loops:for loop 6

Example:26
Factorial of a number , get the following output
Example:
n=3
1*2*3=6
n=5
1*2*3*4*5=120
Sol:

#include <stdio.h>

int main()
{
    int i,n,f=1;
    printf("Enter any no ");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        f=f*i;
        printf("%d ",i);
        if(i<n)
            printf(" * ");
    }
    printf(" = %d",f);

    return 0;
}

Output:

Enter any no 5
1 * 2 * 3 * 4 * 5 = 120

Enter any no 3
1 * 2 * 3 = 6

Example:27
C program to calculate the value of x to the power y by taking input for the values of base and power?
Example :
(i). b=2 p=3 : 2*2*2 =8
(ii). b=2 p=5 : 2*2*2*2*2 =32
Sol:

#include <stdio.h>

int main()
{
    int i,b,p,r=1;
    printf("Enter values of base and power ");
    scanf("%d %d",&b,&p);
    for(i=1;i<=p;i++)
    {
        r=r*b;
    }
    printf("Result  = %d",r);

    return 0;
}

Output:

Enter values of base and power 2 5
Result = 32

Enter values of base and power 2 3
Result = 8

Example:28
Print All upper case alphabet using for loop
Print all lower case alphabets using for loop
Print all digits using for loop
Sol:

#include <stdio.h>

int main()
{
    int i;
    printf("Upper case alphabets\n");
    for(i=65;i<=90;i++)
    {
        printf("%c ",i);
    }
    printf("\n");
    for(i='A';i<='Z';i++)
    {
        printf("%c ",i);
    }
    printf("\nLower case alphabets\n");
    for(i=97;i<=122;i++)
    {
        printf("%c ",i);
    }
    printf("\n");
    for(i='a';i<='z';i++)
    {
        printf("%c ",i);
    }
    printf("\nDigits \n");
    for(i=48;i<=57;i++)
    {
        printf("%c ",i);
    }
    printf("\n");
    for(i='0';i<='9';i++)
    {
        printf("%c ",i);
    }

    return 0;
}

Output:

Upper case alphabets
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Lower case alphabets
a b c d e f g h i j k l m n o p q r s t u v w x y z
a b c d e f g h i j k l m n o p q r s t u v w x y z
Digits
0 1 2 3 4 5 6 7 8 9
0 1 2 3 4 5 6 7 8 9

Example:29
Different forms of for loop
Note: all the argument passed in for loops are optional.
For loop can take following forms
1. for(a;b;c)
2. for(;b;c)
3. for(a;;c)
4. for(a;b;)
5. for(a;;)
6. for(;b;)
7. for(;;c)
8. for(;;)
Sol:

The output is same for all the methods:

1
2
3
4
5
6
7
8
9
10

Method: 1.
for(a;b;c)
{
}

/*
Method: 1.
for(a;b;c)
{
}
*/
#include <stdio.h>
int main()
{
    int i;
    for(i=1;i<=10;i++)
    {
        printf("%d\n",i);
    }
    return 0;
}

Method:2.
for(;b;c)
{
}

/*
Method:2.
for(;b;c)
{
}
*/
#include <stdio.h>
int main()
{
    int i=1;
    for(;i<=10;i++)
    {
        printf("%d\n",i);
    }
    return 0;
}

Method:3.

for(a;;c)
{
}

/*
Method:3.

for(a;;c)
{
}
*/
#include <stdio.h>
int main()
{
    int i;
    for(i=1;;i++)
    {
        printf("%d\n",i);
        if(i>=10)
            break;
    }
    return 0;
}

Method:4.

for(a;b;)
{
}

/*
Method:4.

for(a;b;)
{
}
*/
#include <stdio.h>
int main()
{
    int i;
    for(i=1;i<=10;)
    {
        printf("%d\n",i);
        i++;
    }
    return 0;
}

Method:5.

for(a;;)
{
}

/*
Method:5.

for(a;;)
{
}
*/
#include <stdio.h>
int main()
{
    int i;
    for(i=1;;)
    {
        printf("%d\n",i);
        if(i>=10)
            break;
        i++;
    }
    return 0;
}

Method:6.

for(;b;)
{
}

/*
Method:6.

for(;b;)
{
}
*/
#include <stdio.h>
int main()
{
    int i=1;
    for(;i<=10;)
    {
        printf("%d\n",i);
        i++;
    }
    return 0;
}

Method:7.

for(;;c)
{
}

/*
Method:7.

for(;;c)
{
}
*/
#include <stdio.h>
int main()
{
    int i=1;
    for(;;i++)
    {
        printf("%d\n",i);
        if(i>=10)
           break;
    }
    return 0;
}

Method:8.

for(;;)
{
}

/*
Method:8.

for(;;)
{
}
*/
#include <stdio.h>
int main()
{
    int i=1;
    for(;;)
    {
        printf("%d\n",i);
        if(i>=10)
           break;
        i++;
    }
    return 0;
}

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