C Language Programs
81. Program to add two numbers using pointer.
82. Program to add first and last digit of a number.
83. Program to find area of triangle using Heron's formula.
84. Program to convert Binary to Decimal.
85. Program to convert Decimal numbers to Binary.
86. Program to find f(x) by Lagrange's interpolation method.
87. Program to check the leap year.
88. Program to find nCr & nPr.
89. Program for Newton Raphson General.
90. Program to calculate the sum of even numbers from 1 to n.
91. Simpson 1/3 rule.
92. Program to add two strings without using concat() function.
93. Program to check vowels in string.
94. Program to compare two strings.
95. Program to compare strings without using strcmp() function.
96. Program to convert string from uppercase to lowercase.
97. Program to copy char array / copy string.
98. Program to copy string without using strcpy() function.
99. Program to count frequency of characters in a string.
100. Program to count total number of uppercase and lowercase in a string.
CODE
#include<stdio.h>
#include<conio.h>
void main()
{
int first, second, *p, *q, sum;
clrscr();
printf("Enter two integers : \n");
scanf("%d %d", &first, &second);
p = &first;
q = &second;
sum = *p + *q;
printf("\nSum of entered numbers : %d", sum);
getch();
}
82. Program to add first and last digit of a number.
#include<stdio.h>
#include<conio.h>
void main()
{
int input, firstNum, lastNum;
clrscr();
printf("Enter number : ");
scanf("%d", &input);
lastNum = input % 10;
firstNum = input;
while (firstNum >= 10)
firstNum /= 10;
printf("\nAddition of first and last number : %d + %d = %d",
firstNum, lastNum, firstNum + lastNum);
getch();
}
83. Program to find area of triangle using Heron's formula.
#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
double a, b, c, s, area;
clrscr();
printf("\nEnter the sides of triangle : \n");
scanf("%lf%lf%lf", &a, &b, &c);
s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));
printf("\nArea of triangle using Heron's Formula : %.2lf", area);
getch();
}
84. Program to convert Binary to Decimal.
#include<stdio.h>
#include<math.h>
#include<conio.h>
int binary_decimal(int n);
void main()
{
int n;
char c;
clrscr();
printf("Enter Binary number : ");
scanf("%d", &n);
printf("%d in binary = %d in decimal", n, binary_decimal(n));
getch();
}
//Function to convert binary to decimal.
int binary_decimal(int n)
{
int decimal = 0, i = 0, rem;
while (n != 0)
{
rem = n % 10;
n /= 10;
decimal += rem * pow(2, i);
++i;
}
return decimal;
}
85. Program to convert Decimal numbers to Binary.
#include<stdio.h>
#include<conio.h>
void main()
{
int n, c, k;
clrscr();
printf("Enter a decimal number : ");
scanf("%d", &n);
printf("\n%d in binary number system is : ", n);
for (c = 31; c >= 0; c--)
{
k = n >> c;
if (k & 1)
{
printf("1");
}
else
{
printf("0");
}
}
printf("\n");
getch();
}
86. Program to find f(x) by Lagrange's interpolation method.
#include<stdio.h>
#include<conio.h>
void main()
{
float x[10], y[10], temp = 1, f[10], sum, p;
int i, n, j, k = 0, c;
clrscr();
printf("How many record you will enter : ");
scanf("%d", &n);
for (i = 0; i < n; i++)
{
printf("\n\nenter the value of x%d: ", i);
scanf("%f", &x[i]);
printf("\n\nEnter the value of f(x%d): ", i);
scanf("%f", &y[i]);
}
printf("\n\nEnter X for finding f(x): ");
scanf("%f", &p);
for (i = 0; i < n; i++)
{
temp = 1;
k = i;
for (j = 0; j < n; j++)
{
if (k == j)
{
continue;
}
else
{
temp = temp * ((p - x[j]) / (x[k] - x[j]));
}
}
f[i] = y[i] * temp;
}
for (i = 0; i < n; i++)
{
sum = sum + f[i];
}
printf("\n\nf(%.1f) = %f ", p, sum);
getch();
}
87. Program to check the leap year.
#include<stdio.h>
#include<conio.h>
void main()
{
int year;
clrscr();
printf("Enter a year : ");
scanf("%d", &year);
if (year % 400 == 0)
printf("\n%d is a leap year.", year);
else if (year % 100 == 0)
printf("\n%d is not a leap year.", year);
else if (year % 4 == 0)
printf("\n%d is a leap year.", year);
else
printf("%d is not a leap year.", year);
getch();
}
88. Program to find nCr & nPr.
#include<stdio.h>
#include<conio.h>
long factorial(int);
long find_ncr(int, int);
long find_npr(int, int);
void main()
{
int n, r;
long ncr, npr;
clrscr();
printf("Enter the value of n and r : \n");
scanf("%d %d", &n, &r);
ncr = find_ncr(n, r);
npr = find_npr(n, r);
printf("%dC%d = %ld\n", n, r, ncr);
printf("%dP%d = %ld\n", n, r, npr);
getch();
}
long find_ncr(int n, int r)
{
long result;
result = factorial(n) / (factorial(r) * factorial(n - r));
return result;
}
long find_npr(int n, int r)
{
long result;
result = factorial(n) / factorial(n - r);
return result;
}
long factorial(int n)
{
int c;
long result = 1;
for (c = 1; c <= n; c++)
result = result * c;
return (result);
}
89. Program for Newton Raphson General.
#include<stdio.h>
#include<math.h>
int user_power, i = 0, cnt = 0, flag = 0;
int coef[10] = {0};
float x1 = 0, x2 = 0, t = 0;
float fx1 = 0, fdx1 = 0;
int main()
{
printf("PROGRAM FOR NEWTON RAPHSON GENERAL");
printf("\nEnter the total no. of power : ");
scanf("%d", &user_power);
for (i = 0; i <= user_power; i++)
{
printf("\nx^%d : ", i);
scanf("%d", &coef[i]);
}
printf("\n");
printf("\n\nThe Polynomial is ");
//printing coeff.
for (i = user_power; i >= 0; i--)
{
printf("%dx^%d", coef[i], i);
}
printf("\n\nIntial x1 -> ");
scanf("%f", &x1);
printf("Iteration\tX1\tFX1\tF'X1");
do
{
cnt++;
fx1 = fdx1 = 0;
for (i = user_power; i >= 1; i--)
{
fx1 += coef[i] * (pow(x1, i));
}
fx1 += coef[0];
for (i = user_power; i >= 0; i--)
{
fdx1 += coef[i] * (i * pow(x1, (i - 1)));
}
t = x2;
x2 = (x1 - (fx1 / fdx1));
x1 = x2;
printf("\n\t%d\t%.3f\t%.3f\t%.3f ", cnt, x2, fx1, fdx1);
}
while ((fabs(t - x1)) >= 0.0001);
printf("\n\nThe root of equation is %f", x2);
return 0;
}
90. Program to calculate the sum of even numbers from 1 to n.
#include<stdio.h>
#include<conio.h>
void main()
{
int sum = 0, n;
clrscr();
printf("Enter the number : ");
scanf("%d", &n);
// Using Math formula
// (n/2)((n / 2) + 1)
sum = ((n / 2) * ((n / 2) + 1));
printf("Sum of even numbers from 1 to %d : %d", n, sum);
getch();
}
91. Simpson 1/3 rule.
#include<stdio.h>
float f(float x)
{
return (1 / (1 + x));
}
void main()
{
int i, n;
float x0, xn, h, y[20], so, se, ans, x[20];
clrscr();
printf("\nEnter values of x0,xn,h: ");
scanf("%f%f%f", &x0, &xn, &h);
n = (xn - x0) / h;
if (n % 2 == 1)
{
n = n + 1;
}
h = (xn - x0) / n;
printf("\nRefined value of n and h are:%d and %f\n", n, h);
printf("\n Y values: \n");
for (i = 0; i <= n; i++)
{
x[i] = x0 + i * h;
y[i] = f(x[i]);
printf("\n %f\n", y[i]);
}
so = 0;
se = 0;
for (i = 1; i < n; i++)
{
if (i % 2 == 1)
{
so = so + y[i];
}
else
{
se = se + y[i];
}
}
ans = h / 3 * (y[0] + y[n] + 4 * so + 2 * se);
printf("\nFinal integration is %f", ans);
getch();
}
92. Program to add two strings without using concat() function.
#include<stdio.h>
#include<string.h>
void concat(char[], char[]);
void main()
{
char s1[50], s2[30];
clrscr();
printf("\nEnter String 1 : ");
gets(s1);
printf("\nEnter String 2 : ");
gets(s2);
concat(s1, s2);
printf("\nConcated string is : %s", s1);
getch();
}
void concat(char s1[], char s2[])
{
int i, j;
i = strlen(s1);
for (j = 0; s2[j] != '\0'; i++, j++)
{
s1[i] = s2[j];
}
s1[i] = '\0';
}
93. Program to check vowels in string.
#include<stdio.h>
int count_vowels(char []);
int check_vowel(char);
void main()
{
char array[100];
int c;
clrscr();
printf("Enter a string : ");
gets(array);
c = count_vowels(array);
printf("\nNumber of vowels in %s : %d", array, c);
getch();
}
int count_vowels(char a[])
{
int count = 0, c = 0, flag;
char d;
do
{
d = a[c];
flag = check_vowel(d);
if (flag == 1)
count++;
c++;
} while (d != '\0');
return count;
}
int check_vowel(char a)
{
if (a >= 'A' && a <= 'Z')
{
// Converting to lower case
a = a + 'a' - 'A';
}
if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
return 1;
return 0;
}
94. Program to compare two strings.
#include <stdio.h>
#include <string.h>
void main()
{
char a[100], b[100];
clrscr();
printf("\nEnter the first string : ");
gets(a);
printf("\nEnter the second string : ");
gets(b);
if (strcmp(a, b) == 0)
printf("\nEntered strings are equal.");
else
printf("\nEntered strings are not equal.");
getch();
}
95. Program to compare strings without using strcmp() function.
#include<stdio.h>
int stringCompare(char[], char[]);
void main()
{
char str1[100], str2[100];
int compare;
clrscr();
printf("Enter first string : ");
scanf("%s", str1);
printf("Enter second string : ");
scanf("%s", str2);
compare = stringCompare(str1, str2);
if (compare == 1)
printf("\nBoth strings are equal.");
else
printf("\nBoth strings are not equal.");
getch();
}
int stringCompare(char str1[], char str2[])
{
int i = 0, flag = 0;
while (str1[i] != '\0' && str2[i] != '\0')
{
if (str1[i] != str2[i])
{
flag = 1;
break;
}
i++;
}
if (flag == 0 && str1[i] == '\0' && str2[i] == '\0')
return 1;
else
return 0;
}
96. Program to convert string from uppercase to lowercase.
#include<stdio.h>
#include<string.h>
#include<conio.h>
void main()
{
char str[20];
int i;
clrscr();
printf("Enter string : ");
gets(str);
for (i = 0; i <= strlen(str); i++)
{
if (str[i] >= 65 && str[i] <= 90)
{
str[i] = (char) (str[i] + 32);
}
}
printf("String in lowercase : %s", str);
getch();
}
97. Program to copy char array / copy string.
#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char source[] = "C program";
char destination[50];
clrscr();
strcpy(destination, source);
printf("Source string: %s\n", source);
printf("Destination string: %s\n", destination);
getch();
}
98. Program to copy string without using strcpy() function.
#include<stdio.h>
#include<conio.h>
void strCopy(char[], char[]);
void main()
{
char str1[100], str2[100];
printf("Enter any string: ");
scanf("%s", str1);
strCopy(str1, str2);
printf("After copying: %s", str2);
getch();
}
void strCopy(char str1[], char str2[])
{
int i = 0;
while (str1[i] != '\0')
{
str2[i] = str1[i];
i++;
}
str2[i] = '\0';
}
99. Program to count frequency of characters in a string.
#include<stdio.h>
#include<string.h>
#include<conio.h>
void main()
{
char str[1500];
int c = 0, count[26] = {0};
clrscr();
printf("Enter a string : ");
gets(str);
while (str[c] != '\0')
{
if (str[c] >= 'a' && str[c] <= 'z')
count[str[c] - 'a']++;
c++;
}
for (c = 0; c < 26; c++)
{
if (count[c] != 0)
printf("%c occurs %d times in the string.\n", c + 'a', count[c]);
}
getch();
}
00. Program to count total number of uppercase and lowercase in a string.
#include<stdio.h>
#include<string.h>
#include<conio.h>
void main()
{
int upper = 0, lower = 0;
char ch[80];
int i;
clrscr();
printf("Enter string : ");
gets(ch);
i = 0;
while (ch[i] != '\0')
{
//uppercase counter
if (ch[i] >= 'A' && ch[i] <= 'Z')
{
upper++;
}
//lowercase counter
if (ch[i] >= 'a' && ch[i] <= 'z')
{
lower++;
}
i++;
}
printf("\nUppercase Letters : %d", upper);
printf("\nLowercase Letters : %d", lower);
getch();
}00. Program to count total number of uppercase and lowercase in a string.
#include<stdio.h>
#include<string.h>
#include<conio.h>
void main()
{
int upper = 0, lower = 0;
char ch[80];
int i;
clrscr();
printf("Enter string : ");
gets(ch);
i = 0;
while (ch[i] != '\0')
{
//uppercase counter
if (ch[i] >= 'A' && ch[i] <= 'Z')
{
upper++;
}
//lowercase counter
if (ch[i] >= 'a' && ch[i] <= 'z')
{
lower++;
}
i++;
}
printf("\nUppercase Letters : %d", upper);
printf("\nLowercase Letters : %d", lower);
getch();
}
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