Convert string to integer c programming

• We can convert string to integer in c Programming by using atoi() function.
• atoi() is a library function from C. 
• int atoi(const char *str) ;
• Now we will write a C program to convert String format number to integer.
• Read input from user as string.
• Convert string to integer using atoi() function.

Program #1: Write a C program to convert String to integer in c Programming.

1. #include<stdio.h>
2. #include<stdlib.h>
3.  
4. int main() {
5.    int number;
6.    char number_string[3];
7.  
8.    printf("Please Enter a number : ");
9.    scanf("%s", number_string);
10.  
11.    number = atoi(number_string);
12.    printf("\n number_string : %d", number);
13.  
14.    getch();
15. }

 Output: