动态内存的分配

 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
char* upcase(char *inputstring);
                                                                                                                
int main(void){
    char *str1;
    str1 = upcase("hello");
    printf("str1=%s \\n",str1);
    free(str1);
    return 0;
}
 
char* upcase(char *inputstring)
{
    char *newstring;
    int counter;
 
    if(!(newstring=malloc(strlen(inputstring)+5)))
    {   
        printf("Error malloc !\\n");
        exit(1);
    }   
 
    strcpy(newstring,inputstring);
    for(counter =0; counter < strlen(newstring); counter++){
        if(newstring[counter] >= 97 && newstring[counter] <=122)
        {   
            newstring[counter] -= 32; 
        }   
    }   
 
    return newstring;
 
}
//该片段来自于http://www.codesnippet.cn/detail/130120148509.html

来源: http://www.codesnippet.cn/detail/130120148509.html