C Language 👨‍💻

104. Program to check the palindrome of word using array. #include<stdio.h> #include<conio.h> #include<string.h> void main() { char word[100]; int length, counter; clrscr(); printf("Enter a word : "); scanf("%s", word); length = strlen(word); int flag = 1; for (counter = 0; counter < length / 2 && flag; counter++) { if (word[counter] != word[length - counter - 1]) { flag = 0; break; } } if (flag) { printf("\n%s is a palindrome.", word); } else { printf("\n%s is NOT a palindrome.", word); } getch(); } @C_Codings

103. Program to check the palindrome of string. #include<stdio.h> #include<conio.h> #include<string.h> void main() { char text[100]; int begin, middle, end, length = 0; clrscr(); printf("Enter the string to check if it is a palindrome : \n"); gets(text); while (text[length] != '\0') { length++; } end = length - 1; middle = length / 2; for (begin = 0; begin < middle; begin++) { if (text[begin] != text[end]) { printf("\nString is not a palindrome."); break; } end--; } if (begin == middle) printf("\nString is Palindrome."); getch(); } @C_Codings

102. Program to calculate the length of string without using strlen() function. #include<stdio.h> #include<conio.h> void main() { char s[1000], i; clrscr(); printf("Enter a string : "); scanf("%s", s); for (i = 0; s[i] != '\0'; ++i); printf("Length of string : %d", i); getch(); } @C_Codings

101. Program to calculate the length of string. #include<stdio.h> #include<conio.h> #include<string.h> void main() { char a[100]; int length; clrscr(); printf("\nEnter a string to calculate it's length : "); gets(a); length = strlen(a); printf("\nLength of entered string is : %d", length); getch(); } @C_Codings

100. 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(); } @C_Codings

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(); } @C_Codings

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'; } @C_Codings

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(); } @C_Codings

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(); } @C_Codings

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; } @C_Codings

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(); } @C_Codings

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; } @C_Codings

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'; } @C_Codings

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(); } @C_Codings

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(); } @C_Codings

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; } @C_Codings

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); } @C_Codings

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(); } @C_Codings

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(); } @C_Codings

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(); } @C_Codings