dataStructure/minprintf.c at master · taohi/dataStructure · GitHub

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#include <stdarg.h>
#include <stdio.h>
void minprintf(char *fmt,...)
{
    va_list ap;
    char *p,*sval;
    int ival;
    double dval;

    va_start(ap,fmt);
    for(p=fmt;*p;p++)
    {
        if(*p!='%')
        {
            putchar(*p);
            continue;
        }
        switch(*++p)
        {
            case 'd':
                ival=va_arg(ap,int);
                printf("%d",ival);
                break;
            case 'f':
                ival=va_arg(ap,double);
                printf("%f",ival);
                break;
            case 's':
                for(sval=va_arg(ap,char *);*sval;sval++)
                    putchar(*sval);
                break;
            default:
                putchar(*p);
                break;
        }
    }
}

void main()
{
    minprintf("%d\n",12);
}