Function atof() atoi() itoa()

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DATA CONVERSION

The following functions convert between data types.

        atof()         converts an ascii character array to a float

        atoi()         converts an ascii character array to an integer

        itoa()         converts an integer to a character array

---

Example

        /* convert a string to an integer */

        #include <stdio.h>

        #include <stdlib.h>

        char string[] = "1234";

        main()

        {

               int sum;

               sum = atoi( string );

               printf("Sum = %d\n", sum );

        }

---

/* convert an integer to a string */

        #include <stdio.h>

        #include <stdlib.h>

        main()

        {

               int sum;

               char buff[20];

               printf("Enter in an integer ");

               scanf(" %d", &sum );

               printf( "As a string it is %s\n", itoa( sum, buff, 10 ) );

        }

Note that itoa() takes three parameters,

• the integer to b converted
• a character buffer into which the resultant string is stored
• a radix value (10=decimal,16=hexadecimal)

In addition, itoa() returns a pointer to the resultant string.