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Basic C Programs for Interview Success: Key to Technical Excellence in 2023

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basic c programs for interview

Let’s discuss 10 basic C programs for interview success.

Program 1 : Addition of 2 numbers 

#include<stdio.h>
#include<conio.h>
main()
{
   int a;
   int b;
   int s;
   clrscr();
   a=56;
   b=89;
   s=a+b;
   printf("%d",s);
   
 }

The same C program can be written as below:

#include<stdio.h>
#include<conio.h>
main()
{
   int a =56; b=89;
   clrscr();
   printf("%d +%d = %d",a,b,a+b);
}

The output of program depends on formatted printf()
The sample are tabulated as below:

printf() statement Change in output
printf(“%d”,s);145
printf(“sum=%d”,s);sum=145
printf(“a+b=%d”,s);a+b=145
printf(“%d +%d=%d”,a,b,s);56+89=145
printf(“%d + %d = %d”,a,b,a+b);56+89=145
printf(“Sum of %d and %d is %d”,a,b,s)Sum of 56 and 89 is 145

Program Flow Chart

As per google , A flowchart is a type of diagram that represents a workflow or process.

Simple Basic Flowchart Diagram3

Program 2: Perform arithmetic operations on 2 integers 

#include<stdio.h>
#include<conio.h>
main()
{
     int a,b,s,d,p,r;
     float q;
     clrscr();
     printf("Enter two numbers :");
     scanf("%d%d",&a,&b);
     s=a+b;
     d=a-b;
     p=a*b;
     q=a/(float)b;
     s=a+b;
     d=a-b;
     p=a*b;
     q=a/(float)b;
     r=a%b;
     printf("a=%d and b=%d\n",a,b);
     printf("\nSum = %d",s);
     printf("\nDifference=%d",d);
     printf("\nProduct = %d",p);
     printf("\nQuotient = %f",q);
     printf("\nReminder after interger division = %d",r);

Output:

Enter two numbers: 20 8
a = 20 and b =8
Sum = 28
Difference = 12
Product = 160
Quotient = 2.500000
Reminder after interger division = 4

Program 3: Calculate Area and Circumference of circle 

#include<stdio.h>
#include<conio.h>
main()
{
      int r;
      float a,c;
      clrscr();
      printf("Enter radius of circle: ");
      scanf("%d",&r);
      a=3.14*r*r;
      c=2*3.14*r;
      printf("\nArea of circle is %f",a);
      printf("\nCircumference of circle is %f",c);

Output:

Enter radius of circle: 10
Area of circle is 314.000000
Circumference of circle is 62.800000

Program 4: To Calculate Simple Interest (basic c programs for interview)

Simple Interest = PNR/100
Where,
P is principal amount
N is number of year (period)
R is rate of interest

#include<stdio.h>
#include<conio.h>
main()
{
      int p,n
      float r,I;
      clrscr();
      printf("Enter Principal Amount:");
      scanf("%d",&p);
      printf("Enter duration in years:");
      scanf("%d",&n);
      printf("Enter rate of interest:");
      scanf("%f",&r);
      I=p/100*r*n;
      printf("\nSimple interest is %f",I);
}

Output:

Enter Principal Amount: 5000
Enter duration in years: 5
Enter rate of interest: 8.5

Simple interest is 2125.000000

Program 5: To convert temperature from degree Celsius to degree Fahrenheit (basic c programs for interview)

Fahrenheit = (9/5) * Celsius+32
i.e. F = 1.8 * C+32
Where,
F is Temperature in Fahrenheit
C is Temperature in Celsius

#include<stdio.h>
#include<conio.h>
main()
        float f, c;
        clrscr();
        printf("Enter temperature in dergree Celsius:");
        scanf("%f",&c);
        f=1.8*c+32;
        printf("\nTemperature in degree Fehrenheit is %.2f",f);

Output:

Enter temperature in degree Celsius: 32.5
Temperature in degree Fehrenheit is 90.50

Program 6: To swap(interchange) value of two variables by using a temporary variable (basic c programs for interview)

Suppose we input a=100 and b=200
Logic for swapping

Consider temporary variable t
Step 1: t = a => t = 100
Step 2: a = b => a = 200
Step 3: b= t => b = 100

After swapping a=200 and b=100

#include<stdio.h>
#include<conio.h>
main()
{
     int a,b,t;
     clrscr();
     printf("Enter 2 numbers:");
     scanf("%d%d",&a,&b);
     t=a;
     a=b;
     b=t;
     printf("\nAfter swapping\n");
     printf("\na = %d",a);
     printf("\nb =%d",b);
     
}

Program 7: To Swap(interchange) value of two variables without using third variable (basic c programs for interview)

Suppose we input a=100 and b=200

Logic for swapping

Step 1: a= a+b => a = 100 + 200=300
Step 2: b =a -b => b = 300-200=100
Step 3: a = a – b => a = 300-100=200

After swapping a=200 and b=100

#include<stdio.h>
#include<conio.h>
main()
{
     int a,b,t;
     clrscr();
     printf("Enter 2 numbers:");
     scanf("%d%d",&a,&b);
     a=a+b;
     b=a-b;
     a=a-b;
     printf("\nAfter swapping\n");
     printf("\na =%d",a);
     printf("\nb =%d",b);
}

Output:

Enter 2 numbers: 100  200
After swapping
a = 200
b = 100

Program 8: To input price in decimal form and print the output in paise

Suppose the price is 15.65
To convert into paise multiply it by 100
Logic for swapping

#include<stdio.h>
main()
{
float p;
int pp;
clrscr();
printf("\nEnter price in Rs.");
scanf("%f",&p);
pp=p*100;
printf("\nPrice in Paise %d",pp);
getch();
}

Output:

Enter price in Rs. 16.95
Price in Paise is 1695

Program 9: To input Roll number and Marks in 5 subjects out of 100 each. Calculate percentage and print it. (basic c programs for interview)

Note:
To Calculate percentage first calculate total marks by adding all marks. Then calculate percentage as
percentage = total * 100/500
or
percentage = total/5

#include<stdio.h>
main()
{
    int roll_no;
    int m1,m2,m3,m4,m5,total;
    float per;
    clrscr();
    printf("Give Roll Number:");
    scanf("%d",&roll_no);
    printf("\nEnter marks in 5 subjects:");
    scanf("%d%d%d%d%d",&m1,&m2,&m3,&m4,&m5);
    total=m1+m2+m3+m4+m5;
    per = total/5;
    printf("\nRoll Number: %d",roll_no);
    printf("\nMarks in subject 1: %d",m1);
    printf("\nMarks in subject 2: %d",m2);
    printf("\nMarks in subject 3: %d",m3);
    printf("\nMarks in subject 4: %d",m4);
    printf("\nMarks in subject 5: %d",m5);
    printf("\nToatl Marks obtained out of 100 is %d",total);
    printf("\nPercentage = %.2f",per);
    getch();
}

Output:

Give Roll Number: 5
Enter marks in 5 subjects: 89 77 90 88 75
Roll Number: 5
Marks in Subject 1: 89
Marks in Subject 2: 77
Marks in Subject 3: 90
Marks in Subject 4: 88
Marks in Subject 5: 75
Total Marks obtained out of 100 is 419
Percentage = 83.80

Program 10: To calculate salary sheet of employee by inputting basic salary.

Consider the following computations.
DA (Dearness Allowance) = 21% of Basic
HRA (House Rent Allowance) = 15% of Basic
TA(Traveling Allowance) = 5% of Basic
Gross Salary = Basic + DA + HRA + TA
Insurance = Rs. 500
PF(Provident Fund) = 12% of Basic
Net Salary = Gross Salary – Insurance – PF

#include<stdio.h>
#include<conio.h>
main()
{
    int b;
    float d,h,t,gross,i,p,net;
    clrscr();
    printf("\nGive your Basic Salary:");
    scanf("%d",&b);
    d=b*0.21;
    h=b*0.15;
    t=b*0.05;
    gross = b+d+h+t;
    i=500;
    p=b*0.12;
    net=gross-(i+p);
    printf("\nBasic Pay = Rs.%d",b);
    printf("\nDA = Rs.%.2f",d);
    printf("\nHRA = Rs.%.2f",h);
    printf("\nTA = Rs.%.2f",t);
    printf("\nGross Salary = Rs.%.2f",gross);
    printf("\nInsurance = Rs.500");
    printf("\nPF = Rs.%.2f",p);
    printf("\n\nYour Net Salary is Rs. %.2f",net);
}

Output:

Give your Basic Salary: 12550
Basic Pay = Rs. 12550
DA        = Rs. 2635.50
HRA       = Rs. 1882.50
TA        = Rs. 627.50
Gross Salary = Rs.17695.50
Insurance = Rs. 500
PF        = Rs.1506.00
Your Net Salary is Rs.15689.50

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