在C语言里怎么把字符转化为数字呢

可以用atoi函数，是将字符串转换成函数，在里面，原型是int atoi(const char *nptr);

你可以在madn里面查到，我给你把结果弄下来吧，还有atol是转换为长整数，atof是转换为浮点数，这个是上面的例子

Example

/* ATOF.C: This program shows how numbers stored

* as strings can be converted to numeric values

* using the atof, atoi, and atol functions.

*/

#include

#include

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