首先来一段代码:
000010 IDENTIFICATION DIVISION.
000011 PROGRAM-ID. LESSON01-1.
000020 ENVIRONMENT DIVISION.
000030 DATA DIVISION.
000040 WORKING-STORAGE SECTION.
000050 77 N PIC 99.
000060 PROCEDURE DIVISION.
000070 ACCEPT N.
000080 ADD 3 TO N.
000081 DIVIDE 5 INTO N.
000082 SUBTRACT 2 FROM N.
000083 MULTIPLY 8 BY N.
000090 DISPLAY N.
000100 STOP RUN.
加法语句(ADD)
例:ADD A TO B. B=B+A 表示数据项A的值和数据项B的值相加,结果置于B中。
减法语句(SUBTRACT)
SUBTRACT Y FROM Z. Z=Z-Y
乘法语句(MULTIPLY)
例:
MULTIPLY A BY B. B=B*A
MULTIPLY A BY B GIVING C. C=A*B
除法语句(DIVIDE)
例:DIVIDE Z INTO X. X=X/Z
DIVIDE 2 INTO Z GIVING X. X=Z/2
四种算术语句的小结
1.一个语句只能进行一种单一的运算,
不能在一个语句中实现两种不同的运算.
2.加法和减法语句可以进行两个以上数值量的计算.
3.四种算术语句都有两种形式,
即带有GIVING部分和不带GIVING.
另外:前面加上COMPUTE 就可以像其他语言一样进行数值运算
例如 COMPUTE A = Z / C.
COMPUTE Q = ( A + B ) * D.
000010 IDENTIFICATION DIVISION.
000020 PROGRAM-ID. STUDY3-103.
000030 ENVIRONMENT DIVISION.
000040 DATA DIVISION.
000050 WORKING-STORAGE SECTION.
000060 77 R PIC 9(2).
000070 77 L PIC 99V9.
000080 77 S PIC 9(5)V9(2).
000090 77 R-P PIC 9(2).
000100 77 L-P PIC 99.9.
000110 77 S-P PIC *(5).9(2).
000111 77 A PIC 9V99.
000120 PROCEDURE DIVISION.
000121 MOVE 3.14 TO A
000130 ACCEPT R.
000140 COMPUTE L = ( R * 2 ) * A.
000150 COMPUTE S = R * R * A .
000160 MOVE R TO R-P.
000170 MOVE L TO L-P.
000180 MOVE S TO S-P.
000190 DISPLAY 'R = ' R-P.
000200 DISPLAY 'L = ' L-P.
000210 DISPLAY 'S = ' S-P.