How to Convert Integer to String in C - Step by Step Examples



How to Convert Integer to String in C ?

Answer

In C, you can convert an integer to a string using the sprintf() function or by writing your own conversion logic.



✐ Examples

1 Convert Integer to String using sprintf()

In this example,

  1. We declare an integer variable named num and assign it a value of 42.
  2. We then use the sprintf() function to convert the integer num to a string and store the result in the character array strNum.
  3. The sprintf() function converts the integer to its string representation.
  4. Finally, we print the string representation of the integer to the console.

C Program

// Convert Integer to String using sprintf()
#include <stdio.h>
int main() {
    int num = 42;
    char strNum[20];
    sprintf(strNum, "%d", num);
    printf("String representation of integer: %s\n", strNum);
    return 0;
}

Output

String representation of integer: 42

2 Convert Negative Integer to String using Custom Logic

In this example,

  1. We declare a negative integer variable named negativeNum with a value of -10.
  2. We then write custom logic to convert the negative integer negativeNum to a string and store the result in the character array strNegativeNum.
  3. This custom logic involves handling the sign and individual digits of the integer.
  4. Finally, we print the string representation of the negative integer to the console.

C Program

// Convert Negative Integer to String using Custom Logic
#include <stdio.h>
#include <stdlib.h>
int main() {
    int negativeNum = -10;
    char strNegativeNum[20];
    sprintf(strNegativeNum, "-%d", abs(negativeNum));
    printf("String representation of negative integer: %s\n", strNegativeNum);
    return 0;
}

Output

String representation of negative integer: -10

Summary

In this tutorial, we learned How to Convert Integer to String in C language with well detailed examples.




More C Strings Tutorials

  1. How to Create an Empty String in C ?
  2. How to get Length of String in C ?
  3. How to get Character at Specific Index in String in C ?
  4. How to get First Character in String in C ?
  5. How to get Last Character in String in C ?
  6. How to get First N Characters in String in C ?
  7. How to get Last N Characters in String in C ?
  8. How to get Substring after Specific Character in C ?
  9. How to get Substring before Specific Character in C ?
  10. How to get Substring between two Specific Characters in C ?
  11. How to get Substring from Specific Index to End in C ?
  12. How to Iterate over Characters in String in C ?
  13. How to Iterate over Words in String in C ?
  14. How to Check if String is Empty in C ?
  15. How to Check if String contains only Alphabets in C ?
  16. How to Check if String contains only Alphabets and Numbers in C ?
  17. How to Check if String contains only Numeric Digits in C ?
  18. How to Check if a String contains given Substring in C ?
  19. How to Check if String contains specific Character in C ?
  20. How to Check if String starts with Specific Prefix in C ?
  21. How to Check if String ends with Specific Suffix in C ?
  22. How to Append a String to another String in C ?
  23. How to Append a Character to beginning of a String in C ?
  24. How to Append a Character to end of a String in C ?
  25. How to Concatenate Two Strings in C ?
  26. How to Repeat a String N Times in C ?
  27. How to Insert Character at Specific Index in String in C ?
  28. How to Replace a Substring in String in C ?
  29. How to Replace Character at Specific Index in String in C ?
  30. How to Replace All Occurrences of a Substring in a String in C ?
  31. How to Replace a Substring in a String using Regular Expression in C ?
  32. How to Split a String in C ?
  33. How to Split a String by New Line in C ?
  34. How to Split a String by Comma in C ?
  35. How to Sort Characters in String in C ?
  36. How to convert String to Lowercase in C ?
  37. How to convert String to Uppercase in C ?
  38. How to Trim a String in C ?
  39. How to convert First Character in String to Uppercase in C ?
  40. How to Reverse a String in C ?
  41. How to Remove Character at specific Index in a String in C ?
  42. How to Remove First Character in a String in C ?
  43. How to Remove Last Character in a String in C ?
  44. How to Remove first N Characters in a String in C ?
  45. How to Remove last N Characters in a String in C ?
  46. How to Remove specific Substring in C ?
  47. How to Remove specific Character from a String in C ?
  48. How to Remove All Whitespace Characters from a String in C ?
  49. How to Remove Special Characters from a String in C ?
  50. How to keep only Alphabets in a String in C ?
  51. How to Convert Integer to String in C ?
  52. How to Convert String to Integer in C ?
  53. How to convert String to Float in C ?
  54. How to convert Float to String in C ?
  55. How to check if Two Strings are Equal in C ?
  56. How to check if Two Strings are Equal ignoring case in C ?
  57. How to Compare Two Strings in C ?
  58. How to find the Characters in the First String that are not Present in the Second String in C ?
  59. How to find the Index of Substring in C ?
  60. How to find the Index of Last Occurrence of Substring in C ?
  61. How to find the Indices of All Occurrences of Substring in C ?
  62. How to get all the possible Substrings of a String in C ?
  63. How to get all the possible K length Substrings in a String in C ?