Solution 100 problem list

// Input a number and print its square.
#include <stdio.h>

int main() {
 int number;
 printf("Type your number");
 scanf("%d", &number);
 int square = number * number;

 printf("the square of the number is: %d", square);

    return 0;
}

// Find area of a rectangle using user input.

#include <stdio.h>

int main() {
 float length, width;
 printf("Type the length of the rectangle: ");
 scanf("%f", &length);
 printf("Type the width of the rectangle: ");
 scanf("%f", &width);

 float areaOfRectangle =  length * width;

 printf("the square of the number is: %0.3f", areaOfRectangle);

    return 0;
}

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1. Input temperature in Celsius and convert to Fahrenheit.
   

   // Input temperature in Celsius and convert to Fahrenheit. 
   
   #include <stdio.h>
   
   int main() {
       float cel, far;
   
       printf("Type the celcius value");
   
       scanf("%f", &cel);
       far = (cel * 9/5) + 32;
       printf("The Fahrenheit value is: %f", far);
   
   
       return 0;
   }
   

   
   

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// 2. Sum of First 10 Natural Numbers
// Write a C program to compute the sum of the first 10 natural numbers.
// Expected Output :
// The first 10 natural number is :
// 1 2 3 4 5 6 7 8 9 10
// The Sum is : 55
// ===============================

#include <stdio.h>

int main() {
    int sum = 0;
    for (int i = 1; i <= 10; i++){
        sum += i;
    }

    printf("Sum of First 10 Natural Numbers %d", sum);

    return 0;
}

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// Fibonacci Number Series
// 0, 1, 1, 2, 3, 5, 8, 13, 21, and 34
#include <stdio.h>

int main() {
   int a, b, next;
   a = 0;
   b = 1;
  printf("%d\n%d\n", a, b);
for (int i = 3; i <= 10; i++)
{
next = b + a;
printf("%d  \n",next);
 a = b;
 b = next;
}

    return 0;
}

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Question: Write a C program using a for loop to print this pattern.

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

Answer:

#include <stdio.h>

int main() {

   for (int row = 1; row <=5; row++){
       for (int col = 1; col <=row; col++ ){
          printf("%d", col);
   }
          printf("\n");
   }

    return 0;
}

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// Write a C program to print numbers from 0 to 10 and 10 to 0 using two while loops.

#include <stdio.h>

int main() {
    int i = 0;
while(i<=10){
    printf("%d\n", i);
    i++;
}
printf("\n-------\n");
int j = 10;
while(j>=0){
    printf("%d\n", j);
    j--;
}


    return 0;
}

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//Write a C program that calculates the product of numbers from 1 to 5 using a while loop.

#include <stdio.h>

int main() {
    int i = 1, prod = 1;

    while(i<=5){
        prod = prod * i;
        i++;
    }
    // Write C code here
    printf("%d", prod);

    return 0;
}

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