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5.1.98 printf
Procedure from library standard.lib (see standard_lib).
- Syntax:
printf (string_expression[,any_expressions] )- Return:
none
- Purpose:
printf(fmt,...);performs output formatting. The first argument is a format control string. Additional arguments may be required, depending on the content of the control string. A series of output characters is generated as directed by the control string; these characters are displayed (i.e., printed to standard out).
The control stringfmtis simply text to be copied, except that the string may contain conversion specifications.
Dohelp print;for a listing of valid conversion specifications. As an addition to the conversions ofprint, the%nand%2conversion specification does not consume an additional argument, but simply generates a newline character.- Note:
If one of the additional arguments is a list, then it should be enclosed once more into a
list()command, since passing a list as an argument flattens the list by one level.
Example:
ring r=0,(x,y,z),dp;
module m=[1,y],[0,x+z];
intmat M=betti(mres(m,0));
list l=r,m,M;
printf("s:%s,l:%l",1,2);
→ s:1,l:int(2)
printf("s:%s",l);
→ s:(0),(x,y,z),(dp(3),C)
printf("s:%s",list(l));
→ s:(0),(x,y,z),(dp(3),C),y*gen(2)+gen(1),x*gen(2)+z*gen(2),1,1
printf("2l:%2l",list(l));
→ 2l:list("(0),(x,y,z),(dp(3),C)",
→ module(y*gen(2)+gen(1),
→ x*gen(2)+z*gen(2)),
→ intmat(intvec(1,1 ),1,2))
→
printf("%p",list(l));
→ [1]:
→ // characteristic : 0
→ // number of vars : 3
→ // block 1 : ordering dp
→ // : names x y z
→ // block 2 : ordering C
→ [2]:
→ _[1]=y*gen(2)+gen(1)
→ _[2]=x*gen(2)+z*gen(2)
→ [3]:
→ 1,1
→
printf("%;",list(l));
→ [1]:
→ // characteristic : 0
→ // number of vars : 3
→ // block 1 : ordering dp
→ // : names x y z
→ // block 2 : ordering C
→ [2]:
→ _[1]=y*gen(2)+gen(1)
→ _[2]=x*gen(2)+z*gen(2)
→ [3]:
→ 1,1
→
printf("%b",M);
→ 0 1
→ ------------------
→ 0: 1 1
→ ------------------
→ total: 1 1
→
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