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# include <stdio.h>
 
int main( )
{
    int radius;
    double area;
    for(radius = 1; radius <= 10 ; radius++)
    {
        area = 3.1416 * radius * radius;
        /* ÈôÔ²Ãæ»ý³¬¹ý120£¬ÔòÌø³öforÑ­»·£¬²»ÓèÊä³ö */
        if(area >= 120.0)
            break;  // Ìø³öÑ­»·
        printf("square = %f\n", area);
    }
    printf("now radius=%d\n\n", radius-1);
 
    for(radius = 1; radius <= 10 ; radius++)
    {
        area = 3.1416 * radius * radius;
        /* ÈôÔ²Ãæ»ýûÓг¬¹ý60£¬Ôò²»Êä³ö¶øÊÇ´ÓпªÊ¼Ñ­»· */
        if(area < 120.0)
            continue;  // »Øµ½Ñ­»·Í·²¿,¼ÌÐøÏÂһѭ»·
        printf("square = %f\n", area);
    }
    printf("now radius=%d\n", radius-1);
    return 0;
}


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 #include <stdio.h>
#define MAX 100
int a[MAX], b[MAX], count = 0;
void rData()
{ int i;
FILE *fp;
fp = fopen("C:\\100.dat", "r");
for (i=0; i<MAX; i++)
fscanf(fp, "%d,", &a[i]);
fclose(fp);
}
 
void main()
{ int i;
rData();
//printf("Âú×ãÌõ¼þµÄÊý= ......

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      ÔÚCÓïÑÔÖУ¬½á¹¹ÊÇÒ»ÖÖ¸´ºÏÊý¾ÝÀàÐÍ£¬Æä¹¹³ÉÔªËØ¼È¿ÉÒÔÊÇ»ù±¾Êý¾ÝÀàÐÍ£¨Èçint¡¢long¡¢floatµÈ£©µÄ±äÁ¿£¬Ò²¿ÉÒÔÊÇһЩ¸´ºÏÊý¾ÝÀàÐÍ£¨ÈçÊý×é¡¢½á¹¹¡¢ÁªºÏµÈ£©µÄÊý¾Ýµ¥Ôª¡£ÔڽṹÖУ¬±àÒëÆ÷Ϊ½á¹¹µÄÿ¸ö³ÉÔ±°´Æä×ÔÈ»¶Ô½ç£¨alignment£©Ìõ¼þ·ÖÅä¿Õ¼ä¡£¸÷¸ö³ÉÔ±°´ÕÕËüÃDZ»ÉùÃ÷µÄ˳ÐòÔÚÄÚ´æÖÐ˳Ðò´ ......

C_ʹÓÃswitchÓï¾ä

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# include <stdio.h>
 
int main()
{
    int num;
    /* ÏÂÃæ¶¨ÒåµÄ¸÷±äÁ¿£¬·Ö±ð´ú±í¸öλ£¬Ê®Î»£¬°Ùλ£¬Ç§Î»£¬Íòλ£¬Ê®ÍòλÒÔ¼°Î»Êý */
    int indiv, ten, hundred, thousand; 
    int ten_thousand, hundred_thous ......
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