22. Write a program which requests a user to enter an amount of money. The program
prints the interest payable per year for rates of interest from 5% to 12% in steps
of 0.5%.

#include <stdio.h>
int main (){
 int y=0;
 double m,r,i;
 printf ("enter the amount of money : ");
 scanf ("%lf",&m);
 printf ("YEAR  INTEREST\n\n");
 for (r=0.05; r<=0.12; r+=0.005; y++)
 i=m*r;
 printf ("\n%d %6.2f",y,i);
}

[此贴子已经被作者于2019-9-25 17:55编辑过]

#include <stdio.h>

int main( void )
{
    double money;
    printf( "enter the amount of money: " );
    if( scanf("%lf",&money)!=1 || money<0 )
        return 1;

    //  from 5% to 12% in steps of 0.5%
    printf( "RATE\tINTEREST\n");
    for( unsigned rate=50; rate<=120; rate+=5 )
    {
        double interest = money * rate/1000.;
        printf( "%4.1f%%\t%6.2f\n", rate/10., interest );
    }
}

输入
输出

marn ??

Thank you !

But how can I add the year++ in the for loop to calculate year ?

printf ("enter the amount of money : "); 完完全全的中式英文.

很明显的for语句括号里可以有三个语句（语句1；语句2；语句3）并用分号隔开，而楼主多写了一个分号

可以将最后一个分号改成逗号，形成一个逗号表达式
for（r=0.05;r<=0.12;r+=0.005,y++）

Thank you !