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

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How to Convert String to Integer in C ?

Answer

To convert a String to an Integer in C, you can use the atoi() function from the stdlib.h library.

✐ Examples

1 Convert "123" String to Integer

In this example,

We include the stdlib.h header for the atoi() function.
We create a character array named str with a string value of "123".
We then use the atoi() function to convert it to an integer and store the result in the variable number.
Finally, we print the value of number using printf().

C Program

#include <stdio.h>
#include <stdlib.h>

int main() {
    char str[] = "123";
    int number = atoi(str);
    printf("Integer value: %d\n", number);
    return 0;
}

Output

Integer value: 123

2 Convert "456" String to Integer

In this example,

We include the stdlib.h header for the atoi() function.
We create a character array named str with a string value of "456".
We then use the atoi() function to convert it to an integer and store the result in the variable number.
Finally, we print the value of number using printf().

C Program

#include <stdio.h>
#include <stdlib.h>

int main() {
    char str[] = "456";
    int number = atoi(str);
    printf("Integer value: %d\n", number);
    return 0;
}

Output

Integer value: 456

Summary

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

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

How to Convert String to Integer in C ?

Answer

✐ Examples

1 Convert "123" String to Integer

C Program

Output

2 Convert "456" String to Integer

C Program

Output

Summary

More C Strings Tutorials