Concatenation: Difference between revisions
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[[String]]concatenation is the operation of joining two character strings end-to-end. For example, the strings "snow" and "ball" may be concatenated to give "snowball". | [[String]] concatenation is the operation of joining two character strings end-to-end. For example, the strings "snow" and "ball" may be concatenated to give "snowball". | ||
In BR, the operator responsible for string concatenation is the ampersand '''&'''. So, the "snowball" example above may be carried out as follows: | In BR, the operator responsible for string concatenation is the ampersand '''&'''. So, the "snowball" example above may be carried out as follows: | ||
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00040 let result$ = string1$ & string2$ & string3$ ! this will result in error | 00040 let result$ = string1$ & string2$ & string3$ ! this will result in error | ||
The above example results in an error, because the default length of the string result$ is 18 characters, as any BR string. The combined length of string1$, string2$, and string3$ is 45 characters. '''Note''' that the error does not result from concatenation. | The above example results in an error, because the default length of the string result$ is 18 characters, as any BR string. The combined length of string1$, string2$, and string3$ is 45 characters. '''Note''' that the error does not result from concatenation. ''string1$ & string2$ & string3$'' works fine. The error occurs when we try to assign a 45 character value to an 18 character string result$. In order to correct the error, we need to | ||
[[Dim|dimension]] result$ to at least 45 characters or more. Below is the corrected example: | [[Dim|dimension]] result$ to at least 45 characters or more. Below is the corrected example: | ||
Revision as of 10:52, 9 January 2012
String concatenation is the operation of joining two character strings end-to-end. For example, the strings "snow" and "ball" may be concatenated to give "snowball".
In BR, the operator responsible for string concatenation is the ampersand &. So, the "snowball" example above may be carried out as follows:
00010 let string1$ = "snow" 00020 let string2$ = "ball" 00030 let result$ = string1$ & string2$ 00040 print result$ ! this will print snowball
You may concatenate as many strings as you like. Note that if you are storing the concatenated result into a string variable, then this variable needs to be dimensioned long enough to fit the combined length of all the concatenated strings. Consider the following example:
00010 let string1$ = "snow" 00020 let string2$ = "ball" 00030 let string3$ = " effect of concatenating many strings" 00040 let result$ = string1$ & string2$ & string3$ ! this will result in error
The above example results in an error, because the default length of the string result$ is 18 characters, as any BR string. The combined length of string1$, string2$, and string3$ is 45 characters. Note that the error does not result from concatenation. string1$ & string2$ & string3$ works fine. The error occurs when we try to assign a 45 character value to an 18 character string result$. In order to correct the error, we need to dimension result$ to at least 45 characters or more. Below is the corrected example:
00005 dim result$*45 00010 let string1$ = "snow" 00020 let string2$ = "ball" 00030 let string3$ = " effect of concatenating many strings" 00040 let result$ = string1$ & string2$ & string3$ ! this will result in error