This is a C Program which converts an integer to string & vice-versa.
This C Program converts an integer to string and vice-versa.
Take input from the user and perform string operations as shown in the program below.
Here is a source code of the C program to convert an integer to string & vice-versa. The C program is successfully compiled and run on a Linux system. The program output is also shown below.
/* * C Program which Converts an Integer to String & vice-versa */ #include <stdio.h> #include <string.h> #include <math.h> void tostring(char [], int); int toint(char []); int main() { char str[10]; int num, result; printf("Enter a number: "); scanf("%d", &num); tostring(str, num); printf("Number converted to string: %s\n", str); result = toint(str); printf("Number converted back to integer: %d\n", result); return 0; } void tostring(char str[], int num) { int i, rem, len = 0, n; n = num; while (n != 0) { len++; n /= 10; } for (i = 0; i < len; i++) { rem = num % 10; num = num / 10; str[len - (i + 1)] = rem + '0'; } str[len] = '\0'; } int toint(char str[]) { int len = strlen(str); int i, num = 0; for (i = 0; i < len; i++) { num = num + ((str[len - (i + 1)] - '0') * pow(10, i)); } return num; }
In this C program, we are reading the number using ‘num’ variable. The tostring() function is used to convert an integer to string & vice-versa.
Using tostring() function convert an integer to string. Assign the value of ‘num’ variable to ‘n’ variable. While loop is used to check the value of ‘n’ variable is not equal to 0. If the condition is true then execute the loop.
Compute the value of ‘n’ variable by 10 and assign the value to ‘n’ variable. For loop is used to convert an integer to string. Initialize the value of ‘i’ variable as 0 and check the value of ‘i’ variable is less than the value of ‘len’ variable. If the condition is true then execute the loop.
Compute the modulus of the value of ‘num’ variable by 10 and assign the value to ‘rem’ variable. Divide the value of ‘num’ variable by 10 and assign the value to ‘num’ variable. Print the statement as the string converted from an integer.
The toint() function is used to convert an integer to string & vice-versa. Assign the length of the string to ‘len’ variable. For loop is used to convert the string to an integer. Initialize the value of ‘i’ variable to 0 and check the value of ‘i’ variable is less than the value of ‘len’ variable.
If the condition is true then execute the loop using ‘num’ variable. Compute the power value of 10 to the power of the value of ‘i’ variable. Multiply the length of the string with the power value. Add the value with the ‘num’ variable and return the value of ‘num’ variable value. Print the statement as an integer to string and viceversa.
$ gcc stringtoint.c -lm $ ./a.out Enter a number: 12345 Number converted to string: 12345 Number converted back to integer: 12345
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