/*FSCANF.C:This program writes formatted data to afile.It then uses fscanf to read the various databackfromthefile.*/#include <stdio.h>FILE *stream;int main(void){long l;float fp;char s[81];char c;stream=fopen("fscanf.out","w+");if(stream==NULL)printf("The file fscanf.out was not opened\n");else{fprintf(stream,"%s%ld%f%c","a-string",65000,3.14159,‘x‘);/*Set pointer to beginning of file:*/fseek(stream,0L,SEEK_SET);/*Readdatabackfromfile:*/fscanf(stream,"%s",s);fscanf(stream,"%ld",&l);fscanf(stream,"%f",&fp);fscanf(stream,"%c",&c);/*Output data read:*/printf("%s\n",s);printf("%ld\n",l);printf("%f\n",fp);printf("%c\n",c);fclose(stream);}}
注意事项：
fscanf(FILE * stream ,constchar*format, [argument...] );
如果argument为char* str时
str是一个指向字符串数组的指针，用来拷贝读取到的字符串
所以， 可以是 char s[128]
也可以是 char* s = (char *)malloc(128)
但不可以是 char* s; s没有指向有效的内存空间
FILE*fp;char a[10];int b;double c;fscanf(fp,"%s%d%lf",a,&b,&c)
printf("%g",4.5);//4.5
printf("%f",4.5);//4.500000
printf("%e",400.5);//4.5e+2
原文：http://www.cnblogs.com/mybabyyh/p/4202254.html