以上是把int 转换为string 以下是把string 转换为数值 /* ATOF.C: This program shows how numbers stored * as strings can be converted to numeric values * using the atof, atoi, and atol functions. */#include <stdlib.h> #include <stdio.h>void main( void ) { char *s; double x; int i; long l; s = " -2309.12E-15"; /* Test of atof */ x = atof( s ); printf( "atof test: ASCII string: %s\tfloat: %e\n", s, x ); s = "7.8912654773d210"; /* Test of atof */ x = atof( s ); printf( "atof test: ASCII string: %s\tfloat: %e\n", s, x ); s = " -9885 pigs"; /* Test of atoi */ i = atoi( s ); printf( "atoi test: ASCII string: %s\t\tinteger: %d\n", s, i ); s = "98854 dollars"; /* Test of atol */ l = atol( s ); printf( "atol test: ASCII string: %s\t\tlong: %ld\n", s, l ); }Output atof test: ASCII string: -2309.12E-15 float: -2.309120e-012 atof test: ASCII string: 7.8912654773d210 float: 7.891265e+210 atoi test: ASCII string: -9885 pigs integer: -9885 atol test: ASCII string: 98854 dollars long: 98854
int i;
char temp[10];
strcpy(temp, (LPCTSTR)s);
i = atoi(temp);
char number[5];
_itoa(j,number,10);
CString temp;
temp = number;
以下是把string 转换为数值
/* ATOF.C: This program shows how numbers stored
* as strings can be converted to numeric values
* using the atof, atoi, and atol functions.
*/#include <stdlib.h>
#include <stdio.h>void main( void )
{
char *s; double x; int i; long l; s = " -2309.12E-15"; /* Test of atof */
x = atof( s );
printf( "atof test: ASCII string: %s\tfloat: %e\n", s, x ); s = "7.8912654773d210"; /* Test of atof */
x = atof( s );
printf( "atof test: ASCII string: %s\tfloat: %e\n", s, x ); s = " -9885 pigs"; /* Test of atoi */
i = atoi( s );
printf( "atoi test: ASCII string: %s\t\tinteger: %d\n", s, i ); s = "98854 dollars"; /* Test of atol */
l = atol( s );
printf( "atol test: ASCII string: %s\t\tlong: %ld\n", s, l );
}Output
atof test: ASCII string: -2309.12E-15 float: -2.309120e-012
atof test: ASCII string: 7.8912654773d210 float: 7.891265e+210
atoi test: ASCII string: -9885 pigs integer: -9885
atol test: ASCII string: 98854 dollars long: 98854