C Programing - DIU 4th Simister Java Class 01 Problem

One No Problem:
#include <stdio.h>
main()
{
    int a,b,c,big;
    scanf("%d%d%d",&a,&b,&c);
    if (a> b && a>c){
        printf("A is The Larger Number Of Them = %d",a);
    }
    else if(b>a && b>c){
        printf(" B is The Larger Number Of Tem = %d",b);
    }
    else if(c>a && c>b){
        printf("C is The Larger Number Of Them = %d ",c);
    }
    return 0;
}


Two No Problem :

#include<stdio.h>
main(){
    int a,b;
    int sum;
    printf("Type Your Two Digit For Sum, Thank You \n");

    scanf("%d%d",&a,&b);
    printf("Your Two Digit Are %d & %d \n",a,b);
    printf("What You Want To Do . \n 1. Addition + \n 2. Subtrack - \n 3. Multiply * \n 4. Divide  / \n Enter Your Operator Number For Them and Enjoy \n ");
    scanf("%d",&sum);
    switch(sum){
        case 1 :
        printf(" Addition Of The Two Number is %d \n",a+b);
        break;

         case 2 :
        printf(" Subtrack Of The Two Number is %d \n",a-b);
        break;

         case 3 :
        printf(" Multiply Of The Two Number is %d \n",a*b);
        break;

        case 4 :
        printf(" Divide Of The Two Number is %d \n",a/b);
        break;

    }

return 0;
}


Three No Problem :

#include<stdio.h>
main(){
    char letter;
    printf("Enter Your Character Letter \n");
    scanf("%c",&letter);
    printf("Your Character is = %c \n",letter);

    if (letter >= 'A' && letter<='Z'){
        printf("Your Character Is Capital Letter \n");
    }
    else{
        printf("Your Character Small Letter \n");
    }

return 0 ;
}


Four No Problem:
#include<stdio.h>
#include<conio.h>
main(){
    float radius,circal,p;
    float r = 3.1416;
    printf("Enter Your Radius Circal Area \n");
    scanf("%f",&radius);
    circal = r*(radius*radius);
    p = 2*r*radius;
    printf("Your Radius Circal Area Is = %.4f \n",circal);

    printf("\nYour Primitter Area Is = %.4f \n",p);

     int length, breadth, area;
   printf("\nEnter the Length of Rectangle : ");
   scanf("%d", &length);

   printf("\nEnter the Breadth of Rectangle : ");
   scanf("%d", &breadth);

   area = length * breadth;
   printf("\nArea of Rectangle : %d \n", area);

    int side, sqr;

   printf("\nEnter the Length of Side : ");
   scanf("%d", &side);

   sqr = side * side;
   printf("\nArea of Square : %d \n", sqr);


}