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コード: 全て選択

> #include <stdio.h>
> #include <stdlib.h>
> 
> int
> plus(int a, int b)
> {
> 	int c;
> 
> 	c = a + b;
> 
> 	return(c);
> }
> 
> int
> minus(int a, int b)
> {
> 	int c;
> 
> 	c = a - b;
> 
> 	return(c);
> }
> int
> 
> main(int argc, char *argv[])
> {
> 	int a, b;
> 
> 	if (argc != 4) {
> 		printf("too many or too few arguments.\n");
> 		exit(1);
> 	}
> 
> 	a = atoi(argv[1]);
> 	b = atoi(argv[3]);
> 
> 	switch(argv[2][0]) {
> 	case '+':
> 		printf("%d + %d = %d\n", a, b, plus(a, b));
> 		break;
> 
> 	case '-':
> 	  printf("%d - %d = %d\n", a, b, minus(a, b));
> 	  break;
>     
> 	default:
> 		printf("unknown operator\n");
> 	}
> 
> 	exit(0);
> }

コード: 全て選択

#N88BASIC
Function plus(a As Long,b As Long) As Long
   plus=a+b
End Function
Function minus(a As Long,b As Long) As Long
   minus=a-b
End Function
Dim i As Long
Dim Num As Long
Dim MaxNum As Long
MaxNum=100 '足し続ける最大の数字
Num=0
For i=1 To MaxNum
Num=plus(Num,i) 'ここのplusをminusにするとマイナスになる
Next
Print Num