To understand this example, you should have the knowledge of the following C programming topics:
As you know, the best way to concatenate two strings in C programming is by using the strcat() function. However, in this example, we will concatenate two strings manually.
#include <stdio.h>
int main() {
char s1[100] = "programming ", s2[] = "is awesome";
int length, j;
// store length of s1 in the length variable
length = 0;
while (s1[length] != '\0') {
++length;
}
// concatenate s2 to s1
for (j = 0; s2[j] != '\0'; ++j, ++length) {
s1[length] = s2[j];
}
// terminating the s1 string
s1[length] = '\0';
printf("After concatenation: ");
puts(s1);
return 0;
}
After concatenation: programming is awesome
Here, two strings?s1?and?s2?and concatenated and the result is stored in?s1.
It's important to note that the length of?s1?should be sufficient to hold the string after concatenation. If not, you may get unexpected output.
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.